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OAS 3.GM.1.3 Worksheets

OAS 3.GM.1.3 (Oklahoma, 3rd Grade): "Classify angles within a polygon as acute, right, obtuse, and straight." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.

Geometry & Measurement (GM) 3.GM.1 Analyze and use geometric attributes to describe and create polygons and three-dimensional figures in various contexts. 3.GM.1.3Classify angles within a polygon as acute, right, obtuse, and straight.

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3.GM.1.3

OAS 3.GM.1.3 Worksheets - Determining 90 Angle worksheet

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Determining 90 Angle

4g1

Decide whether an angle shown is a right angle (90°).
Tell the difference between right angles and angles that are smaller (acute) or larger (obtuse).
Recognize that perpendicular lines meet to make a 90° angle.

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OAS 3.GM.1.3 Worksheets - Determining Visually worksheet

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Determining Visually

4g1

Identify whether an angle is acute, right, obtuse, or straight by looking at it.
Compare an angle to a right angle as a quick visual benchmark.
Notice when an angle is smaller than 90°, exactly 90°, between 90° and 180°, or exactly 180°.
Use the shape and direction of the rays to classify angles even when they are rotated.

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OAS 3.GM.1.3 Worksheets - Determining Angles in Shapes worksheet

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Determining Angles in Shapes

4g1

Spot and name acute, right, and obtuse angles in different shapes.
Count how many of each type of angle a shape has.
Use the corners (vertices) of a polygon to decide where the angles are.

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OAS 3.GM.1.3 Worksheets - Finding a Shape by Its Angles worksheet

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Finding a Shape by Its Angles

4g1

Classify the angles inside a polygon as acute, right or obtuse
Judge a whole shape by the mix of angles it contains
Recognize that a shape can hold all three kinds of angle at once
Rule out a shape by finding the kind of angle it is missing

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