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The area of the base of a right circular...

The area of the base of a right circular cone is `400 pi` and its height is 15 cm. The curved surface area of the cone (in `cm^2`) is :
एक लम्ब वृत्तीय शंकु के आधार का क्षेत्रफल `400 pi` है और इसकी ऊंचाई 15 सेमी है | इस शंकु का वक्र पृष्ठ क्षेत्रफल ( वर्ग सेमी में ) है :

A

`480 pi`

B

`500 pi`

C

`450 pi`

D

`560 pi`

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