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d=88.7/22
d=28
r=14
L=22/7.14.14=616
K = 88 CM
MAKA :
K = 2 x π x r
88 = 2 x 22/7 x r
88 = 44/7 x r
r = 88x7 / 44
r = 14 cm
jadi LUAS = π x r²
= 22/7 x 14²
= 616 cm²