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(ket)
r = 21-14
= 7
Larsir = Lpersegipanjang - L1/4lingkaran
= p . l - 1/4 . πr^2
= 21 . 10 - 1/ 4. 22/7 . 7^2
= 210 - 38,5
= 171,5 cm persegi
maaf cuma bisa no. 11