exam Maths Puzzle Numerical Ability

a swimming pool has the shape of a semi-circle. if the area is 308 square meters, find the perimeter of the pool.[pi=22/7]

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3-a-4/a+3=a^2-2/a+3 I need help solving [3+(4b+1)]^2 I know what the answer should be, 16b^2+32b+16 but I am not sure how to actually work the problem out to find the answer.