Hitunglah keliling lingkaran dgn diameter a)21cm b)17,5cm

Cara keliling = pi x d

21cm = 22/7 x 21 = 66 Cm
17,5cm = 22/7 x 17,5 = 55 Cm

semoga membantu

A) K= pi x d
= 22/7 x 21
= 66
b) k = pi x d
= 22/7 x 17,5
= 55