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π=22/7
a. luas sisi bola=luas lingkaran
=π.r²
=22/7 . 17,5
=385/122,5
=3,14cm²
b. luas permukaan belahan bola padat
=3.π.r²
=3 . 22/7 . 17,5²
=66/21 . 306,25
=3,14 . 306,25
=961,625cm²