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L=4πr²
r²=L÷4π=1256÷4.3,14=100
r=√100=10
2).
Luas½ bola terbuka 2πr² atau ½πd²
Luas½ bola tertutup 3πr² atau ¾πd²
Volume½bola ⅔πr³ atau ½πd³
3).
V=πr²t
r²=V÷πt=88÷22/7.7=4
r=√4=2
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