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Students today you will learn to identify and draw three different types of angles.

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Arizona Mathematics Standards 4th Grade

Geometry (G)

4.G.A Draw and identify lines and angles, and classify shapes

by properties of their lines and angles.

4.G.A.1

Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

4.G.A.2

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 (e.g., understand right triangles as a category, and identify right triangles).

4.G.A.3

Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.

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Geometry, the branch of mathematics concerned with the shape of individual objects, spatial relationships among various objects, and the properties of surrounding space. It is one of the oldest branches of mathematics, having arisen in response to such practical problems as those found in surveying, and its name is derived from Greek words meaning “Earth measurement.” Eventually it was realized that geometry need not be limited to the study of flat surfaces (plane geometry) and rigid three-dimensional objects (solid geometry) but that even the most abstract thoughts and images might be represented and developed in geometric terms.

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Pencil , Paper, Ruler, Protractor

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Today we will go over three types of angles. I want you to take your ruler and draw these angles in your math notebook as I draw them and identify them on the board.Next we will go over the vocabulary and measurements of each angle.

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Right Angle is 90 degrees.
Acute angle is any angle smaller than 90 degrees.
Obtuse angle is any angle bigger than 90 degrees but smaller than 180 degrees.

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Lets watch this video and review what we have learned.

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Finding Right, Acute, and Obtuse Angles: Grade 4 Module 4 Lesson 2

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You will complete this worksheet on your own, to see what you have learned. Look closely at each angle and write on the line next to it if it's a Right, Obtuse or Acute angle. If you have any question, please stay in your seat and raise your hand. I will come to you.

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Now boys and girls, we will work together in finding the angles on this worksheet with the protractors. I will draw them on the board, and show you how to measure the angle. Work with your partner next to you and if you need help, please raise your hand., and I will come around.

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Arizona Mathematics Standards 4th Grade
4.MP.5 Use appropriate tools strategically. Mathematically proficient students consider available tools when solving a mathematical problem. They choose tools that are relevant and useful to the problem at hand. Proficient students are sufficiently familiar with tools appropriate for their grade or course to make sound decisions about when each of these tools might be helpful; recognizing both the insight to be gained and their limitations. Students deepen their understanding of mathematical concepts when using tools to visualize, explore, compare, communicate, make and test predictions, and understand the thinking of others.

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Arizona Department of Education (2016, December). Arizona  Mathematics Standards:
https://cms.azed.gov/home/GetDocumentFile?id=58546f52aadebe13008c1a2c

Finding Right, Acute, and Obtuse Angles: Grade 4 Module 4 Lesson 2
https://www.youtube.com/watch?v=g7K4zztMXT0

Identifying Angles worksheet
http://deeshox.tk/identifying-angles-worksheet/

Encyclopedia Britanica. Geometry (January 9, 2017) Contributer, JL Heilbron
https://www.britannica.com/topic/geometry

Reading Protractor worksheet
https://www.mathworksheets4kids.com/angles/measuring/reading-protractor-large.png