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The internal and external radii of a hol...

The internal and external radii of a hollow hemispherical vessel are 6 cm and 7 cm respectively. What is the total surface are (in `cm^2`) of the vessel ?
एक खोखले अर्धगोलीय बर्तन की आतंरिक और बाह्न त्रिज्या क्रमश 6 सेमी और 7 सेमी है | इस बर्तन का कुल पृष्ठ क्षेत्रफल ( वर्ग सेमी में ) ज्ञात करें |

A

`183 pi`

B

`189 pi`

C

`177 pi`

D

`174 pi`

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