Find the perimeter of this semi-circle with radius, r = 45 cm. Give your answer rounded to 1 DP.
r = 45
d = 45 * 2 = 90
P = 90pi
I assume DP is decimal point
And if you round to 1 decimal point, it would be about...
(it would be 282.6 if you use 3.14 though)
Perimeter = 231.4 cm