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r= 42/2 = 21cm
dit: L?
penye:
L= ♎r^2
L= 22/7 × 21^2
L= 22/7 × 21 × 21
L= 66 × 21
L= 1386 cm
ket: ^(pangkat)
r = jari-jari
d/2
42 / 2 = 21 cm
L = πr²
22/7 x 21 x 21
= 1386 cm²