OAS 6.GM.3.2 Worksheets

OAS 6.GM.3.2 (Oklahoma, 6th Grade): "Develop and use the fact that the sum of the interior angles of a triangle is 180° to determine missing angle measures in a triangle." 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.

6.GM.3.1

Geometry & Measurement (GM) 6.GM.3 Understand and use relationships between angles in geometric figures. 6.GM.3.2Develop and use the fact that the sum of the interior angles of a triangle is 180° to determine missing angle measures in a triangle.

6.GM.4.1

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6.GM.3.2

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Using the Angle Sum of a Triangle

8g5

• Use the fact that a triangle's angles add to 180 degrees
• Find a missing angle when two angles are equal
• Add two angle measures to check a statement
• Tell a true statement about angles from a plausible one

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Finding a Missing Angle in a Triangle

8g5

• Add the two known angles of a triangle.
• Subtract from 180 to find the third.
• Check the answer against the drawing.

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Why the Angles of a Triangle Add to 180

8g5

• See that the three corners of a triangle fit along a straight line.
• Say that a straight line measures 180 degrees.
• Use the fact to find a missing angle.