How many metres of 5 m wide cloth will be required to make a conical tent, the radius of whose base is 3.5 m and height is 12 m ?

+2 votes
1 view
asked Dec 30, 2017 in Class IX Maths by ashu Premium (926 points)
How many metres of 5 m wide cloth will be required to make a conical tent, the radius of whose base is 3.5 m and height is 12 m ?

Please log in or register to answer this question.

1 Answer

0 votes
answered Dec 30, 2017 by saurav24 Expert (1,431 points)

 l = h2 + r(3.5)2 + (12)12.25 + 144 

= √156.25 = 12.5 m

Curved surface area = πrl = 22 / 7 × 3.5 × 12.5 = 137.5 m2  

Area of cloth = 137.5 m

Length of cloth required = C.S.A. / Width 

l = 137.5 / 5 = 27.5 m 

Related questions

+1 vote
1 answer