Question

Find the perimeter of the semicircle below. Use 3.14 for
pi.
1.6 ft

Answer 1

8.2ft

Explanation:

Perimeter of a whole circle = 2*pi*r with radius r

Here we have 1.6ft as the radius so the whole circle's perimeter would be

2 * 3.14 * 1.6 = 10.048

We have half the circle so we half this number to 5.024.

Now we have to add the bottom straight line, which is two radii (two lots of 1.6)

5.024 + 1.6 + 1.6 = 8.224 which is rounded to 8.2ft