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Luas lingkaran =
a) Keliling
x 84 = 264
Luas
x 1764= 5544
b) Keliling
x 30 = 94.285714285714 ≈ 94,29
Luas
x 225 = 707.14285714286 ≈ 707,14
K = 2 x π x r
= 2 x 22/7 x 42
= 246 cm
L = π x r2
= 22/7 x 42 x 42
= 5544 cm
b.
K = 2 x π x r
= 2 x 22/7 x 15
= 94,28 cm
L = π x r2
= 22/7 x 15 x 15
= 707,14 cm
Smga Membantu, Maaf jika salah >.<