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=4×3,14×10×10
=1256
B. L1/2lingkaran = 2*Llingkaran
=2×π×r²
=2×3,14×10×10
=628
C. Lpermukaan bola=4×π×r²
=4×3,14×10×10
=1256
b. Ls=½πd²=½.3,14.10²=157 cm²
c. Lp=Lb+Ls=78,5+157=235,5 cm²
atau
Lp=3/4πd²=3/4.3,14.10²=235,5 cm²