Triangle ABC has the following vertices: A(-8,7)
B(0,-5)
C(9,1)
Is triangle ABC a right triangle, and why?

Yes, because AB is perpendicular to BC.

Slope of AB is -2/3
Slope of BC is -2/-3
Making the two Line segments perpendicular to each other.

He trapezoid is composed of a rectangle and two triangles. what is the area of the rectangle? what is the total area of the triangles? what is the area of the trapezoid? ? a) 42 cm2; 27 cm2; 69 cm 2 b) 54 cm2; 27 cm2; 81 cm 2 c) 108 cm2; 27 cm2; 135 cm 2 d) 108 cm2; 13.5 cm2; 121.5 cm 2