8.GR.A: Make conjectures about and verify geometric relationships.

Make conjectures about and verify geometric relationships.

8.GR.A.1Use the relationships between supplementary, complementary, vertical, and adjacent angles to write and solve equations for an unknown angle.8.GR.A.2Draw or build triangles using tools (ruler, protractor, technology, or physical manipulatives) given three measures of angles or sides. Determine whether the given conditions result in a unique triangle, more than one triangle, or no triangle.8.GR.A.3Use informal arguments to verify that the sum of the interior angles of a triangle is 180 degrees and why an exterior angle equals the sum of the two remote interior angles.

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