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L.lingkaran = phi × r^2
= 22/7 × 49^2
= 22× 343
= 7546 cm^2
22 per 7 x 49 x49
=7.546 cm2
2. d=84
(mencari R, D dibagi 2)
R= 42
22per7 x 42 x 42
= 6.204 cm2