Luas bola=4πr²
1386=4×22/7×r²
r²=1386/4×7/22
r²=110,25
r=√110,25
r=10,5
diameter=2r
d=2×10,5
d=21 cm
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Luas bola=4πr²
1386=4×22/7×r²
r²=1386/4×7/22
r²=110,25
r=√110,25
r=10,5
diameter=2r
d=2×10,5
d=21 cm