The length of the base of a triangle is twice its height. If the area of the triangle is 64 square kilometers, find the height.

Area of a triangle = base x height / 2

64 = base x height / 2

(multiply 2 on both sides)

128 = base x height

then if base = 16 and height = 8 then 16 x 8 = 128

thus the base is 16 which is twice the height:8