a)Sometimes

b)Always

c)Never

2)Vertical angles are complementary angles.

a)Sometimes

b)Always

c)Never

3)Given: Triangle ABC is an isosceles triangle with vertex angle B. Which of the following could be proven to be true?

I. The angle bisector of the vertex angle is a median of triangle ABC.

II. The angle bisector of the vertex angle is an altitude of triangle ABC.

III. The angle bisector of the vertex angle is a perpendicular bisector of triangle ABC.

a)I and II

b)II and III

c)I, II, and III

d)none of the above

4)In right triangle DEF with right angle F, altitude FM is drawn from vertex F to M on hypotenuse DE. FE = x + 2, ME = x – 1 , and DM = 2x + 1. Find DE.

a)0.5

b)4

c)6

d)12

5)G lies on the perpendicular bisector of segment AB, AG = x^2, and BG = 4x + 12. Find AG.

a)6 or -2

b)4 or 36

c)3 or 4

d)none of these