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= 35 cm
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sisi 2 = 21 - 14
= 7 cm
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sisi 3 = πD 1/4
= 22/7 . 14 . 2 . 1/4
= 22 cm
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sisi 4 = πD 1/4
= 22/7 . 21 . 2 . 1/4
= 66/2
= 33 cm
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K = s1 + s2 ... + sn
= 35 + 7 + 22 + 33
= 97 cm ( A )