Standards
Prove theorems about triangles and use them to prove relationships in geometric figures including:
 The sum of the measures of the interior angles of a triangle is 180º.
 An exterior angle of a triangle is equal to the sum of its remote interior angles.
 The base angles of an isosceles triangle are congruent.
 The segment joining the midpoints of two sides of a triangle is parallel to the third side and half the length.
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