Question

Calculate the full perimeter of a semicircle with a diameter 8cm. Round to 1 decimal place.

Answer 1

20.6

Explanation:

20.5664 = 20.6

Answer 2

20.6 cm

Explanation:

First find the circumference of a semicircle with diameter 8 cm

C = 1/2 ( pi d)

C = 1/2 ( 3.14 * 8)

C = 12.56cm

Then add the diameter to close the circle

12.56+8 = 20.56 cm

Round to 1 decimal place

20.6 cm