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#maaf kalo salah ^^
maka
K = 2 · 1/2 · 2πr + 4r
= 2πr + 4r
= 2r(π + 2)
= 2(10)(3,14 + 2)
= 20(5,14)
= 102,8 cm
jawab : D
Terimakasih semoga membantu