Lingkaran kelilingya 44 cm luasnya

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Lingkaran kelilingya 44 cm luasnya

Lingkaran:
k (keliling) = 44 cm
L (Luas) = ? cm²
phi = 22/7

k = 44
2 × phi × r (jari-jari) = 44
2 × 22/7 × r = 44
44/7 × r = 44
r = 44 × 7/44
r = 7 cm

L = phi × r × r
= 22/7 × 7 × 7
= 22 × 7 = 154 cm²

senoga membantu

k = 2pi : r \ 44 = 2 times frac{22}{7} : r \ 44 = frac{44}{7} r \ r = 7 \ \ l = pi {r}^{2} \ : : : = frac{22}{7} times {7}^{2} \ : : : = 154 {cm}^{2}