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r = 157/ 6,28
r = 25
L = 3,14 x r x r
= 3,14 x 25 x 25
= 3,14 x 625
= 1962,5 cm2
Keliling = 157 cm.
Ditanya: ↓
Luas Lingkaran = .......?
Dijawab: ↓
K= 2 × 3,14 × R
R =157/ 6,28
R= 25
Luas = 3,14 × R × R
Luas = 3,14 × 25 × 25
Luas = 3,14 × 625
Luas = 1962,5 cm²