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= 3,14 x 10 x 10 = 314 cm persegi
= 314 cm pangkat 2
b. r = 1/2 d - 7 cm
luas = 22/7 x 7 x 7
= 154 cm pangkat 2
c. r = keliling /2phi
= 22 / 22/7 x 2
= 22/ 44/7
= 22 x 7 / 44
= 3,5
luas = 22/7 x 3,5 x 3,5
= 38,5 cm pangkat 2