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(6) Geometry and measurement. The student applies mathematical process standards to analyze
geometric attributes in order to develop generalizations about their properties. The student is
expected to:
(A) identify points, lines, line segments, rays, angles, and perpendicular and parallel lines;
(B) identify and draw one or more lines of symmetry, if they exist, for a two-dimensional
figure;
(C) apply knowledge of right angles to identify acute, right, and obtuse triangles; and
(D) classify two-dimensional figures based on the presence or absence of parallel or
perpendicular lines or the presence or absence of angles of a specified size.

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https://betterlesson.com/community/lesson/22969/classifying-lines
In this lesson plan, the students will be able to identify the different type of lines. In addition they will be able to create their own parallel, perpendicular, and intersecting lines.

TEKS: 111.6 B6 (A) (D)

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https://www.education.com/lesson-plan/simply-symmetry/
In this lesson plan the students will be able to identify symmetrical figures, draw lines of symmetry, and explain why or why not a figure has symmetry. This lesson also allows the students to explore different lines using technology and various manipulatives.

TEKS: 111.6 B6 (B) (C)

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Written by: Loreen Leedy
Illustrated by: Loreen Leedy

TEKS: 111.6 B6 (B) (D)

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Seeing Symmetry by Loreen Leedy | Scholastic

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An assortment of dozens of diverse and colorful examples from quilts to kites to cupcakes invites the reader to discover both line and rotational symmetry.

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https://educators.brainpop.com/lesson-plan/identifying-and-measuring-geometric-angles-lesson-plan/
In this lesson the students will identify examples of different types of angles. In addition this lesson plan allows them to learn how to measure angles with a protractor.

TEKS: 111.6 B6 (C)

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This video would be a good tool to use for the students to overview these concepts. They will learn about geometry terms like point, line, and ray. They will also learn how to label them.

TEKS: 111.6 B6 (A) (B)

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Learn about geometry terms like point, line, and ray. We will also learn how to label them.

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Written by: David A. Adler
Illustrated by: Nancy Tobin

TEKS: 111.6 B6 (C) (D)

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shape up!: fun with triangles and other polygons

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juvenile nonfiction / concepts / size & shape

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juvenile nonfiction / mathematics / general

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juvenile nonfiction / mathematics / geometry

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Shape Up!: Fun With Triangles and Other Polygons

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Shape Up!: Fun With Triangles and Other Polygons [David A. Adler, Nancy Tobin] on Amazon.com. *FREE* shipping on qualifying offers. This takes the fear out of math and puts the fun back in.

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https://www.k-5mathteachingresources.com/4th-grade-geometry.html
This site provides samples of 4th grade geometry activities suitable for use in math centers, small group, or whole class settings. All activities are designed to elicit a range of responses and provide opportunities for students to communicate their reasoning and mathematical thinking.

TEKS: 111.6 B6 (A) (B) (C) (D)

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https://www.pinterest.com/cgoertzen/4th-grade-angles-geometry/
This blog provides various activities for students to do in the classroom. They consist of worksheets, manipulatives to use, creative ideas, etc.

TEKS: 111.6 B6 (A) (B) (C) (D)

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Written by Marilyn Burns
Illustrated by: Gordon Silveria

TEKS: 111.6 B6 (C) (D)

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Amazon.com: The Greedy Triangle (Scholastic Bookshelf): 9780545042208: Burns, Marilyn, Silveria, Gordon: Books

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Sir Cumference and the Sword in the Cone

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Sir Cumference and the Sword in the Cone

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Written by:  Cindy Neuschwander , Illustrated by: Wayne Geehan

TEKS: 111.6 B6 (C) (D)

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sir cumference and the sword in the cone

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juvenile nonfiction / adventure & adventurers

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juvenile nonfiction / mathematics / general

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juvenile nonfiction / mathematics / geometry

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royalty (kings  queens  princes  princesses  knights  etc.)

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Sir Cumference and the Sword in the Cone

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King Arthur has issued a challenge. The first knight to find the sword Edgecalibur will be the next king. Join Sir Cumference, Lady Di of Ameter, and their son, Radius, as they race to help their friend, Vertex, find the sword and discover the secrets of cubes, pyramids, cylinders, and cones.

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This video connects a lot of the concepts that the students are learning to angles and shapes around them in song version. This would be a fun way to introduce them to a lot of the vocabulary that goes with geometry.

TEKS: 111.6 B6 (A) (B) (C) (D)

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Geometry: Lines & Angles Songs For Kids | 3rd Grade - 5th Grade