Question

Tentukan jari jari lingkaran jika diketahui lingkarannya
A. 12.474 cm^2
B. 15.400 cm^2
C. 22.176 cm^2

Answer 1

Πr² = 12.474
22/7 × r² = 12.474
r² = 12.474/22 × 7
= 3969
r = 63 cm

πr² = 15.400
22/7 × r² = 15.400
r² = 15.400/22 × 7
r² = 4900
r = 70 cm

πr² = 22176
22/7 × r² = 22176
r² = 22176/22 × 7
= 7056
r = 84 cm