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Elementary students should learn the difference between 2D and 3D shapes.

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Many key ideas for geometry should be covered in elementary grades. Students should be able to recognize shapes such as circles, squares, rectangles, and rhombuses in the lower grades. Students should also become familiar with lines and angles. Students should specifically know the difference between acute, obtuse, right, and straight angles. Key vocabulary terms associated with geometry in elementary grades include midpoint, bisect, perpendicular, complementary, and many more. Please see the below links for more information.
https://www.youtube.com/watch?v=xzAGoErwAxg

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Free Printable 3D Shape Puzzles - Simply Kinder

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Public Schools of North Carolina Homepage

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2D vs. 3D Shapes! Mr. B's Brain - Ep. 2: 2D and 3D Shapes

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Students should learn about location. Kindergarten students should learn about terms such as above and below. Eventually, students should be able to graph coordinates on a plane.

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What are composite shapes - 1st Grade Math (1.GA.2)

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What is the Relation of an Exterior Angle of a Triangle with its Interior Angles? | Don't Memorise

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Key Ideas that should be covered in the elementary grades:

- Shapes: what makes a shape a certain shape (it has 3 sides, 3 vertices, it is a triangle), the names of each shape, being able to identify those shapes in our world (a window is a square/rectangle), 2D v. 3D, Similarity v. Congruence

- Angles: acute, obtuse, right; an angle is created when two lines meet; in regard to shapes, the point where the lines meet is called a vertex; using protractors to determine the degree of the angle(s)

- Lines: Parallel and perpendicular
- Symmetry
- Measurements: Area, Perimeter, Volume, etc.

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Recognizing shapes | Geometry | Early Math | Khan Academy

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students should be able to identify shapes by name correctly and be able to describe them. They should know the relationship between lines and angles as well as name types of angles as well as the types of lines

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Students should be able to identify and name shapes. They should also be able to identify, describe,  and name different types of angles. By 5th or 6th grade, I would also expect them to know the rules regarding angles (i.e., angles around a single point equal 360 degrees or alternate/corresponding angles are equal). I would hope they've developed an awareness of where that knowledge mightcome in handy in every day life such as when working with blue prints.

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-Students should be able to identify different shapes with their correct names

-Students should know the relationship between lines and angle (two lines connecting form an angle)

-Students should know how to find perimeter and area of shapes with right angles

-Students should know how to use rulers and protractors

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Elementary students should be able to identify shapes and have the correct vocabulary to describe them.

Students should be able to make connections to the world around them regarding shapes and angles.

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Key geometry ideas for elementary students should start in Kindergarten and concepts should be added to the students knowledge as they move up in school.

*They should be able to identify, draw basic geometrical shapes like circles, squares, rectangles, triangles, and polygons and be able to identify those shapes in their everyday life.
*Know what an angle is and start to identify the 6 different types of triangles.
*Learn measurements of shapes-area, circumference, volume.
*Know that shapes have dimension to them.

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Key ideas for geometry that should be covered in the elementary grades...

- Students should be able to not only identify shapes but communicate their properties and vocabulary.
- Students should be able to connect geometry to the "real world" and how it correlates to every day life.
- Students should be able to connect to geometry in early years whether they know they're using geometry or not. For example playing with triangles and angles.
-Students should learn geometry because it correlates with other types of math (e.g. algebra).
- Students should be able to use geometry not just in math class but in visual arts, science and various other subjects. Math is everywhere and holds true for geometry, as well!

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Students should be able to identify and classify shapes. This flows into them visualizing shapes in their everyday surroundings. As students get into higher grades they learn that certain shapes have degrees and angles that must be met in order to that specific shape. Obtuse triangle vs. right triangle. Students will learn about lines, surface area of the shape and space it holds.

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-Ability to draw, recognize, and know the names of shapes
-Recognize shapes in our world/daily lives
-Properties of shapes
-2D vs 3D
-Angles (right, obtuse, acute, supplementary, complimentary, etc.)
-Lines (parallel and perpendicular)
-Coordinate Plane
-Perimeter and Area
-Symmetry
-Composing/Decomposing Shapes

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Introducing geometry-focused story books is an excellent strategy for helping your students gain a deeper understanding of the subject!

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- teaching basic shapes is foundational to support growth into the next levels of geometry.  Two dimensional shapes such as circles, triangles, squares, and other polygons.
- finding shapes in real world examples
- introduction to lines, line segments, angles, vertices,
-relationships that the lines and angles have with one another
- perimeter, area and how to calculate each.

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-1st, geometry teaches shapes ( square, hexagon, cube)
-Then, it teaches how these shapes can interact, build, and influence each other ( these three triangles create a larger triangle, within this octagon we can fit this square and these triangles, these shapes can grow to form 3 D objects)
-Finally, geometry teaches how these shapes are building blocks, tools, for use in our world ( this angle is great for making a bank shot in pool, this triangle is a time honored tool in masonry and architecture called a Key Stone)

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Glossary of Medieval Art and Architecture:keystone

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keystone:
The voussoir at the top of
an arch; in vaulting it occurs at
the intersection of the ribs of a
rib vault. It is important structurally since it marks the apex of the
vault

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Angles
Types of angles
Shapes
Volume
Density
Area and perimeter

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Classifying geometric shapes
Identifying shapes in the real world
Angles and attributes
Volume and surface area
Area and perimeter

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Sides
Angles/Angle types
Area/perimeter
Measurements of angles
The relevance of geometry
Shapes

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Here is a video I like to use in the computer lab. It reviews the 2-D shapes and then lets the students verbally pick out the shape he is describing. He then goes over the 3-D shapes and shows pictures of real world examples. If I had been able to I would have liked to add a 3-D shapes scavenger hunt. However; the time I was alloted for each class never allowed for it.

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3D Shapes | First Grade and Kindergarten Math Learning

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-Identify shapes and where you can find them everywhere
-Measurement of volume, area, perimeter, circumference
-Different types of Angles
-2D vs 3D
-How to use a protractor

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> Shapes and their attributes (categorization and shared attributes)
>Lines and angles
>Area and Perimeter
>Graphing on a coordinate plane (more 4th and 5th grade)

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Spatial recognition is important for young learners in geometry. This is where they begin to learn about spatial relationships among them and their surroundings. Students also learn shapes and can relate them to things in their everyday lives.

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Students start to recognized shapes in their environment.

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Shapes are Everywhere! | Kids Learning Song

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The foundation of geometry is recognizing shapes.  This is a video that my students loved to watch to help them recognized shapes.

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The idea that physical objects students interact with on a daily basis are connected to geometry.
Measurement, angles, dimensions, as well as shape properties are all things I think should be brought up in Elementary school.
The 'building blocks' of life.
(Sorry for my weird looking table.)

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-The variety of angles, such as right, acute, obtuse, or straight angles.
-Symmetry: how shapes can be split in two or how not all shapes are symmetrical.
-Angles play an important role in measurement and partitions of shape, which is symmetry. This helps students understand direction and help them develop skills for the future.
-Symmetry is important to teach because it's a skill that can be used in and out of the classroom.

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Length: Measurement, longer v. shorter, taller v. shorter
3D v. 2D shapes: real world examples and models
Comparing 2D Shapes: angles, sides, rotation, reflection
Composition of 2D Shapes: angles, sides, vertices
Composition of 3D Shapes: faces, edges, vertices
Simple angles in triangles

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The idea that shapes are not flat and have many sides or dimensions.

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The idea that shapes can be put together to make other shapes, and that one shape could be made through various other shapes.

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Elementary students should learn that smaller shapes can form larger shapes and larger shapes can form smaller shapes.

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Erikson Institute Early Math Collaborative

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Feel for Shapes: Geometry Activity for Pre-K and Kindergarten

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In this geometry activity for pre-k and kindergarten, students distinguish shapes using touch rather than sight.

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Students should explore the interior of triangles and quadrilaterals in the upper grades

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"Spatial sense is an intuition about shapes and the relationships between them and is considered a core area of mathematical study, like number "

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Students should learn to sort shapes and recognize properties

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Students should learn how to use diagrams and sketches while developing different geometric concepts, decomposing and composing shapes, and using mental imagery