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phi = 3.14
3.14 x r x r = 314
r =10
keliling lingkaran:
phi x 2r
3.14 x 2 x 10
3.14 x 20 = 62.8 cm
Dit : K
Jawab :
L = π x r x r
314 cm² = 3,14 x r x r
r² = 314 : 3,14
= 100
r = √100 = 10
K = π . 2 . r
= 3,14 . 2 . 10
= 62,8 cm