9) The area of two semicircle are in the ratio 49 : 25. Find the ratio of their circumferences. 

Kindly refer the similar link for your query.
 https://www.meritnation.com/ask-answer/question/the-areas-of-two-circles-are-in-the-ratio-39-64-find-the/mensuration/11746685
Note: Area of semi-circle=πr22Circumference of semi-circle=πr
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