Question

Find out the perimeter of the semicircle

take pie to be 3.142 and write down all the digits in the calculator
the radius of the semicircle is 11cm

Answer 1

P = 11 + (1/2)π(11) = 11 + 5.5π = 28.279 cm

Letting π = 3.142:

P = 11 + (1/2)(3.142)(11) = 28.281 cm