5. The radii of two cylinders are in the ratio 3:7 and their heights are in the ratio 28: 15. Calculate the ratio of their curved surface
areas.
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Answer:
12:35
Step-by-step explanation:
radii ratio = 3:7
lets take x as 2
3x = 3 × 2 = 6
7x = 7 × 2 = 14
radii = 6 and 14
height ratio = 28:15
lets take x as 3
28 × 3 = 84
15 × 3 = 45
height's = 84 and 45
curved surface area formula = 2πR × h
A cylinder
2 × 22/7 × 6 × 84
44/7 × 504
22176/7
3168
B cylinder
2 × 22/7 × 14 × 45
44/7 × 630
27720/7
3960
3168/3960
now you keep on dividing it
and you will get 11/45
= 11:45
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