hitunglah jari-jari lingkaran jika diketahui kelilingnya 264 m

Keliling = phi x d
264 = 22/7 x d
264x7 = 22 x d
1848 = 22 x d
1848/22 = d
84 = d
jari jari = 84/2
= 42 m

K = 2π.r
264 = 2 × 22/7 × r
264 = 44/7 × r
r = 264 × 7/44
r = 6 × 7
r = 42 cm ✔