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L = π × ¼ d²
L = 3,14 × ¼ (20)²
L = 3,14 × ¼ (400)
L = 3,14 × 100
L = 314 cm²
2) persegi Keliling = 200 cm
K = 4s
200 = 4s
s = 200/4
s = 50
Luas = s²
L = (50)² = 2500
3) 25 × 55 : (-5) = 25 × (-11) = -275
4) 30 × -9 + 81 : 9
= -270 + 9
= -261