Hitunglah keliling dan luas lingkaran jika diketahui A. Jari-jari = 14 cm dan B. Diameter = 10,5 cm

kel=2×22/7×14
=44×2
=88cm
L=22/7×14×14
=22×2×14
=616cm
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Keliling lingkaran = pi d = 22/7 x d
Luas lingkaran = pi r^2 = pi x r x r

A. r = 14 cm <=> d = 2r = 14 x 2 = 28 cm
KO = pi x d = pi x d =22/7 x 28 = 88 cm
LO = pi x r x r = 22/7 x 14 x 14 = 616 cm^2

B. d = 10,5 cm <=> r = 1/2d = 10,5/2 cm
KO = pi d = 22/7 x 10,5 = 33 cm
LO = pi r r = 22/7 x 10,5/2 x 10,5/2 = 86, 625 cm^2