Question

Luas suatu lingkaran 1.017,36 cm (persegi). Tentukan diameter lingkaran?

Answer 1

Luas = 3,14 x r^2
1.017,36 = 3,14 x r^2
324 = r^2
r = 18
maka diameter = 2 x 18 =36 cm

Answer 2

L.lingkaran = phi x r x r
1.017,36 = 3,14 x r x r
1.017,36/3,14 = r x r
324= r x r
akar dari 324 = r
18 = r
jadi diameter = 2 x r => 2 x 18 => 36