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Find the curved surface area of a right ...

Find the curved surface area of a right circular cylinder whose height and diameter are 10 cm and 8 cm respectively.
एक लम्ब वृत्तीय बेलन, जिसकी ऊंचाई और व्यास क्रमशः 10cm और 8 cm है, के वक्र पृष्ठ का क्षेत्रफल (`cm^2` में) कितना है?

A

`20 pi`

B

`80 pi`

C

`160 pi`

D

`40 pi`

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