Question

What is the approximate perimeter of the composite figure shown? Use three point one four for pi.

A right triangle has a base of 7 miles, a height of 7 miles, and a third side of 9 miles. A semi-circle is attached to the third side such that the length of the diameter is equal to the length of the third side.

Answer 1

Illustrate a diagram of the problem.

Answer 2

Wait what?

Answer 3

We know the 7 miles + 7 miles = 14 miles, so we have most of the perimeter solved.

Now we need to evaluate the "perimeter" of the semi-circle. Remember that the circumference of a circle is its length, so if you find half the circumference you can find the circle's perimeter.