Question

What is the best approximation for the perimeter of a semicircle with a dimeter of 12cm?

Use 3.14 to approximate pi.
A.18.84cm
B.30.84cm
C.61.68
D.75.36

Answer 1

Answer is choice B: the circumference of a circle is the same as perimeter and is defined by πd (or pi times diameter) We can cut this in half because we are working with a semicircle: so we have 6π which approximates to the value in answer when using 3.14 for pi Woops: forgot to add the diameter of 12 so we would have 30.84