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The height of a cylinder is 30 cm and th...

The height of a cylinder is 30 cm and the diameter of its base is 10 cm. Two identical conical holes each of radius 5 cm and height 12 cm are drilled out. what is the surface area(in `cm^2`) of the remaining solid?
एक सिलेंडर की ऊंचाई 30 सेमी है और इसके आधार का व्यास 10 सेमी है। दो समान शंक्काकार हिद्र प्रत्येक त्रिज्या 5 सेमी और 12 सेमी तक ड्रिल कर बाहर निकाल दिया जाता है शेष ठोस का पृष्ठीय क्षेत्रफल क्या है?

A

`230 pi`

B

`430 pi`

C

`330 pi`

D

`120 pi`

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