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CBSE Class 9 Answered

The vertical height of a cone is 6 cm and the radius of its base is 8 cm  .  Find the whole surface area of the cone  .
Asked by suprakash | 17 Jan, 2016, 12:12: PM
answered-by-expert Expert Answer
h space equals space 6 space c m space r space equals space 8 space c m space l space equals square root of h squared plus r squared end root equals square root of 6 squared plus 8 squared end root equals square root of 100 space equals space 10 T o t a l space S u r f a c e space A r e a space o f space C o n e space equals space πr open parentheses straight r plus straight l close parentheses equals space straight pi cross times 8 cross times open parentheses 8 plus 10 close parentheses equals space straight pi cross times 8 cross times 18 equals space straight pi cross times 144 equals space 3.14 space cross times 144 equals space 452.16 space sq. space cm
Answered by Kajal Gupta | 18 Jan, 2016, 02:03: AM

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CBSE 9 - Maths
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