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Angle Relationships Toolkit Complementary Angles (COMP) Supplementary Angles (SUPP) Complementary angles are two angles that together form a right angle Supplementary angles are two angles that together form a straight line a b 90 w z 180 Vertical Angles (VERT) Corresponding Angles (CORR) Vertical Angles are opposite each other at the intersection of two lines Corresponding angles are in the exact same position at an intersection cg VERT are always congruent If the lines are parallel, then CORR are congruent Alternate Exterior Angles (AEA) Alternate Interior Angles (AIA) AIA are between the lines on opposite sides of the transversal if AEA are outside the lines on opposite sides of the transversal f m if If the lines are parallel, then AIA are congruent Same Side Interior Angles (SSI) SSE angles are outside the lines on the same side of the transversal g m 180 if If the lines are parallel, then SSI are supplementary Triangle Angle Sum Theorem (∆ Sum) cn If the lines are parallel, then AEA are congruent Same Side Exterior Angles (SSE) SSI angles are between the lines on the same side of the transversal if d m if d n 180 If the lines are parallel, then SSE are supplementary ∆ Sum states the measures of the angles in a triangle add up to 180° ∠A+∠B+∠C=180°