Question

Find the perimeter of this semi-circle with radius, r = 19cm. Give your answer rounded to 1 DP.

Answer 1

98 cm

Explanation:

The formula for the perimeter of a semicircle is:

Perimeter = πr + 2r

Where r is the radius of the semicircle.

In this case, r = 19 cm, so the perimeter is:

Perimeter = π(19 cm)+2(19 cm)

=59.71 cm+38 cm

=97.71 cm

Rounded to 1 DP, the perimeter is 98 cm.