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Transcript

Geometry Facts A straight angle (or line) = 180° A right angle = 90° A circle = 180° a C A C C A b When two lines are parallel, they will never cross paths, no matter how far they are extended. D When two angle meet to form a right angle, they are called comlementary. Remember, complementary angles form a corner. Complementary angles add up to 90° ∠BAC and ∠BAD are complementary. B d When two lines cross, vertical angles or opposite angles are equal or congruent. ∠a = ∠b and ∠c = ∠d B A c D When two angle meet to form a straight angle, they are called supplementary. Remember, supplementary angles form a straight line. Supplementary angles add up to 180° ∠BAC and ∠CAD are supplementary. 1 2 3 4 5 6 7 8 B D When two parallel lines are intersected by a transversal, four angles are created at each point of the intersection. The four acute angles are equal. (∠2, 3, 6, 7) The four obtuse angles are equal. (∠1, 4, 5, 8) Each acute angle is supplementary to each obtuse angle.