Jika luas 3/4 lingkaran 462 cm , kelilingnya adalah...

Luas ¾ Lingkaran = 3/4 × π × r²
462 = 3/4 × 22/7 × r²
462 = 66/28 × r²
462 (28) = 66 × r²
12.936 = 66 × r²
196 = r²
r = √196
r = 14 cm

Keliling ¾ Lingkaran = 3/4 × 2 × π × r
••••••••• = 3/2 × 22/7 × 14
••••••••• = 66/14 × 14
••••••••• = 66 cm