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r1 : r2
3 : 5
Lp1 = 144 pi
Dit : Lp 2?
Jawab :
L 1 = 4 pi r^2
144 = 4 pi (3x)^2
144 = 4.9.x^2
x^2 = 144/9.4
x = akar 4
x = 2cm
jadi r1 = 3x = 3(2) = 6cm
r2 = 5(2) = 10cm
L2 = 4 pi r^2
= 4.3,14.100
= 1.256cm^2
=> 400 pi cm^2
mohon maaf apabila ada kesalahan