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.
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.
