Question

A circular well has a radius 3m if a platform of uniformwidth of 1.5m is laid around it find the area of the platform

Answer 1

$Area \: \: of \: \: platform = \pi( {4.5}^{2} - {3}^{2}) \\ \\ = \pi(20.25 - 9) \\ = \pi(11.25) \\ = {35.35m}^{2}$