Review for Test on Chapter 3 and 6-4

c || d None c || d a || b

45⁰ 65⁰ 70⁰ 90⁰ 25⁰ 135⁰

x = 25 x = 18 x = 9.5 2x + x + 15 = 90 3x – 6 = x x – x + 2 = 180

Answer with always, sometimes, or never. 18. In a plane, two lines perpendicular to the same line are _______ parallel. 19. If two lines are cut by a transversal, corresponding angles are ___________ congruent. 20. A transversal perpendicular to one of two parallel lines is ____________ perpendicular to the other one. 21. An obtuse triangle is ____________ isosceles. always sometimes always sometimes

22. Find the sum of the interior angles of a 20-sided figure. 23. Find the sum of the exterior angles of a 40-sided figure. 3240°(20 – 2)180 = 360°

24. Find the measure of one interior angle of a regular octagon. 25. Find the measure of one exterior angle of a regular hexagon. 135° 60°

26. How many sides does a regular polygon have with an exterior angle 12°? 27. If the interior angle of a regular polygon is 108 , then find the measure of the exterior angle? n = 30

Directions: Write answers in spaces provided. 28. List the angles of ΔABC in order from largest to smallest.

29. List the sides of ΔDEF in order from longest to shortest.

Is it possible for a triangle to have sides with the lengths indicated? (Answer YES or NO) 30. 5, 10, , 17, , 7, 4 NO YES

Directions: Write answers in spaces provided. 34. The lengths of two sides of a triangle are 12 and 15. The length of the third side must be greater than _____, but less than _____. 327