What are these?

Points
Point B is the midpoint of line segment AC. AB = 6, BC = 6, what is the length of AC?
12
Complementary Angles add up to _______?
180 degrees
90 degrees
What is this formula for the area of a triangle?
What is this?

Line Segment
Q is between line segment PR. What equation can be made using the Segment Addition Postulate?
PQ + QR = PR
(or QP + RQ = RP)
I have two opposite rays, what am I?

A linear pair
Find the area and perimeter of a rectangle whose length is 10 and width is 5.
Area = 50
Perimeter = 30
What is this.

Line
Point M is between AB. If AM = x-10, MB = 2x-15, and AB = 8, find x.
x = 11
Common Vertex
Common Side
Find the midpoint of the points (3,8) and (-6, -4)
M = (-3/2, 2) or (-1.5, 2)
I am a part of a line that starts at an endpoint and extends forever in one direction. What am I?
Ray
Point M is between AB. If AM = x-10, MB = 2x-15, and AB = 8, find the measurement of AM and MB.
AM = 1
MB = 7
Angle A and angle B are complementary angles. Angle A = 5x + 2, angle B = 3x + 8. Find the value of x AND the measures of angle A and B.
x = 10
Angle A = 52
Angle B = 38
Find the distance between the points (3,8) and (-6, -4)
Distance = 15
I am a flat surface that infinitely large and with zero thickness. What am I?
A plane.

x = 1
True or False
All linear pairs are supplementary angles but not all supplementary angles are linear pairs?
True
Find the base and the height of the triangle. (hint: use the perimeter to find the missing side.
Base = 9.6
Height = 10.8