Given Corresponding angles postulate 7 9 Transitive Property

Given Corresponding angles postulate ∠ 7 ≌∠ 9 Transitive Property (3, 4)

P is parallel to q given P is perpendicular to l given q is perpendicular to l If a line is perpendicular to one of two lines then it is perpendicular to the other. m∠ 2 = 900 Definition of perpendicular m∠ 8 = 900 Definition of perpendicular ∠ 2 ≌ ∠ 8 All right angles are congruent

IN CLASS TEST #1 Q P S YOUR NAME HERE Fill in the blank with either acute, obtuse, or right. R 1) ∠PSR is __________ 2) ∠QSR is __________ Find the angle measurements (you may use a protractor). 3) m∠PSR = ______0 4) m∠PSQ = _____0 5) If OA bisects ∠XOY and m∠XOA=180, then find m∠AOY_________ 7) a pair of alternate exterior angles ___ & ___ 1 3 4 6 8) a pair of alternate interior angles ___ & ___ 9) a pair of complementary angles ____ & _____ 5 7 11) Complementary angles add up to ______0 v 12 Find the measurements of the unknown angles. ∠ 12 _____0 ∠ 13 ______0 ∠ 14 _____0 810 v 10) Supplementary angles add up to ______0 2 v 8 v Please identify: 6) a pair of vertical angles: ____ & ____ 13 14 990

v v v Finding angles on PARALLEL LINES auxiliary line p The Parallel Postulate Through a given point ______ on a line, exactly ____ line may be drawn parallel to the line. v v If _____ lines are parallel to a third line, then the lines are ____ to each other. ACUTE and complimentary, right? The _______ angles of a right triangle are _________ Congruent, congruent If 2 angles of a triangle are _______to 2 angles of another triangle, then the remaining pair of angles are also _________

Lines are parallel if. . . 1) Alternate interior angles are congruent. 2) Corresponding angles are congruent. 3) Alternate exterior angles are congruent. 4) CONVEX pushes out CONCAVE caves in pushes out caves in Proving lines are parallel

Name: __________ Identify each triangle as equilateral, isosceles, scalene, or impossible.