All of the angles in a triangle add up to 180°.

The missing angle is 146°
Answer:
b
Step-by-step explanation:
Y2-y1/x2-x1. so -7-8/-1-(-1)= -15/1
Are you sure there weren't any other numbers in the problem? You can't solve for the volume with out at least two numbers for length, width, or height. Or are you solving for a cube?