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π = 22/7 atau 3,14
dit : d ?
jawab :
L = π x r²
1500 = 3,14 x r²
1500/3,14 = r²
477,71 = r²
√477,7 = r
21,85 = r
ingat nilai d = 2r
maka d = 2 (21,85)
d = 43,7 (cm atau m)