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= 7 cm : 2
= 3,5 cm
Luas alas (lingkaran) = π × r²
= 22/7 × 3,5²
= 22/7 × 12,25
= 22 × 1,75
= 38,5 cm²
Volume = Luas alas × tinggi
= 38,5 cm² × 9 cm
= 346,5 cm³