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r = d/2 = 42/2 = 21 m.
Luas = πr² = 22/7 x 21² = 22 x 63 = 1386 m²
Jadi luasnya adalah 1386 m²
d = keliling / π = 132 : 22/7 = 132 x 7/22 = 42 m.
r = d/2 = 42/2 = 21 m.
Luas = πr² = 22/7 x 21² = 22 x 63 = 1386 m²
Jadi luasnya adalah 1386 m²