Question

On a coordinate plane, triangle D E F has points (negative 8, 8), (10, negative 2), and (negative 8, negative 8).
Find the area of the triangle DEF.

Area =
square units

Answer 1

The points (-8, 8) and (-8, -8) form a vertical side of length 8 - (-8) = 16. The horizontal distance from (10, -2) to the line x = -8 is 10 - (-8) = 18.

Area = (1/2) * base * height = (1/2) * 16 * 18 = 144.

Area = 144 square units