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πd = 132
22/7 d = 132
d = 132 × 7/22
d = 42
2r = d
r = 21
L = πr²
L = 22/7 × 21 × 21
L = 1386 cm²
132=22/7×d
d=132×7/22
d=42
r=21
L=phi×r×r
L=22/7×21×21
L= 1386