The area of a triangle is given by the formula 
, where B is the base and h is the height. We can rearrange this formula to solve for B.
.
We plug in the given area, 640 square millimeters, and the given height, 32 millimeters.
.
40 mm is our final answer.
We plug in the given area, 640 square millimeters, and the given height, 32 millimeters.
40 mm is our final answer.