Solve Applied Problems Using the Law of Cosines
-A painter needs to cover a triangular region 61 meters by 68 meters by 72 meters. A can of paint covers 70 square meters. How many cans will be needed?
A) 28 cans
B) 314 cans
C) 14 cans
D) 3 cans

Question

Quizplus · Accepted Answer

The area of the triangle is 1/2 * 61 * 68 * sin(72) = 1932 square meters. So, 1932 / 70 = 27.6 cans are needed. Since you can't buy a fraction of a can, you need to round up to 28 cans.