Question

if radii of two circular cylinders are in the ratio 3:4 and their heights are in the ratio 6:5 find the radii of their curved surfaces

Answer 1

Answer:

first r=3x

h=6y

second r=4x

h=5y

curved surface area of first cylinder : curved surface area of second cylinder

3x ,6y : 4x,5y

both x,y of cylinder cut with eachother

18 :20 answer

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Answer 2

Answer:

CSA of cylinder = 2*pi*r*h

Radii ratio = 3:4

Heights ratio = 6:5

Ratio of CSA = 2*pi*3r*6h/2*pi*4r*5h

                      = 18/20 = 9/10

                      = 9:10