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to find the perimeter the formula is
perimeter of semicircle ARC-perimeter of semicircle APB+ perimeter of semicircle BSD-perimeter of semicircleCQD
so 22/7*7+14-22/7*3.5+7+22/7*7+14-22/7*3.5+7
=36-18+36-18
=36cm
perimeter of semicircle ARC-perimeter of semicircle APB+ perimeter of semicircle BSD-perimeter of semicircleCQD
so 22/7*7+14-22/7*3.5+7+22/7*7+14-22/7*3.5+7
=36-18+36-18
=36cm
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