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= 1/2 × diameter
= 1/2 × 10,5
= 5,25 cm
Luas lingkaran
= π × r²
= 3.14 × 5,25²
= 3,14 × 27,56
= 86,54 cm ²
luas:
π×r×r
22/7×5,25×5,25
16,5×5,25
86,625cm²