Question

Tolongin dong yg baik..

Answer 1

R1 = 10 cm
r2 = 20 cm
t1 = t2 = 10 cm

Luas:
2πr1(r1+t) = 2πr2(r2+t)
r1(r1+t) = r2(r2+t)
10(10+10) = 20(20+10)
10.20 = 20.30
200 = 600

Luas tabung 1 banding luas tabung 2
200:600
1:3