1.

Sphere cone cylinder have same radius find the ratio of their curved surface

Answer»

Step-by-step EXPLANATION:

Since, the HEIGHT of a sphere is the diameter, the cone and cylinder have height 2r. 

Then 

CURVED surface area of Sphere=4πr²

Curved surface area of cylinder =2πr(2r)=4πr²

Curved surface area of cone = πrl

where, l=(r2+h2)=(r2+(2r)2)=5r2=r5

⇒ Curved surface area of cone =π5r2

Now, 

RATIO of CSA 's a sphere ,cylinder and a cone = 4πr2:2πrh:πrl

=4πr2:4πr2:πr25

=4:4:5


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