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Ditanya => Luas ?
maka, luas = phi x r2
mencari jari - jari = diameter : 2
= 35 m : 2
= 17,5 m
jadi, luas = phi x r2
= 3,14 x 17,5 m x 17,5 m
= 961,625 m2
b) Diketahui => Diameter = 18 cm
Ditanya => Luas ?
maka, luas = phi x r2
mencari jari - jari = diameter : 2
= 18 cm : 2
= 9 cm
jadi, luas = phi x r2
= 3,14 x 9 cm x 9 cm
= 254,34 cm2
mohon koreksinya ^ ^
r = 17,5m
luas lingkaran = phi.r^2 = 3,14.17,5^2 = 961,6m^2
b) d = 18cm
r = 9cm
luas lingkaran = phi.r^2 = 3,14.9^2 = 254,3cm^2