Question

Luas lingkaran yg mempunyai keliling 3,14 cm adalah.....(jari -jari 3,14)

Answer 1

K.lingkaran = 2 π r
3,14 cm = 2 x 3,14 x r
3,14 cm = 6,28 x r
r = 3,14/6,28 = ½ cm
L.lingkaran = π r² = 3,14 x ½² = 3,14 x ¼ = 0,785 cm

Answer 2

jari - jari = keliling : π
= 31,4 : 3,14 = 10 cm⇒diameter
jari-jari = 10/2 = 5 cm
luas = π x r²
= 3,14 x 5 x 5
= 78,5
semoga membantu^_^...