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luas = ∏r2
= 22/7 x 21 x 21
= 1386 cm2
kell = 2∏r
= 2 x 22/7 x 21
= 132 cm
= 22/7 x 42
= 22 x 6
= 132cm
jadi keliling lingkaran tersebut 132cm
L =
= 22/7 x
= 22/7 x 441
= 22 x 63
= 1386
jadi luas lingkaran tersebut 1386