Question

Sebuah lingkaran memiliki luas sebesar 314cm persegi. berapa panjang kelilingnya

Answer 1

L ling = phi × r kuadrat
314 = 3,14 × r kuadrat
314 : 3,14 = r kuadrat
100 = r kuadrat
10 = r

kell ling = 2×phi×r
kell ling = 2×3,14×10
kell ling = 6,28 × 10
kell ling = 62,8

Answer 2

Luas = π × r² 314cm² = 3,14 × r² r² = 314÷3,14 r² = 100 r = √100 r = 10 r = 10, d = 2×d = 2×10 = 20 Keliling = π×d = 3,14 × 20 cm = 6,28 cm