Question

A half circle is joint to an equilateral triangle with side lengths of 12 units. What is the perimeter of the resulting shape?

Answer 1

6π + 24 units ≈ 42.850 units

Explanation:

The side length of the triangle is 12 units, so the radius of the circle is 6 units.

The perimeter of the half circle is:

P = 2πr / 2

P = πr

P = 6π

The perimeter of 2 sides of the triangle is:

P = 2s

P = 24

The total perimeter is:

P = 6π + 24 units

P ≈ 42.850 units