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Diketahui
d = 10,5
r = 5,25
Masukan ke rumus luas lingkaran.
L = πr^2
L = π.5,25^2
L = 3,14 . 27.5625
L = 86,54625.. cm
Dit: L: .......?
Peny:
L= 1/4πd²
L= 1/4×3,14×10,5²
L= 1/4×3,14×110.25
L= 86.54625 cm²