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shubham

· started a discussion

· 1 Months ago

87 question (Question: 107661.0 )

where's 50 comes

Question:

How many metres length of cloth 10 m wide will be required to make a conical tent with base radius of 14 m and height is 48 m?

Options:
A) 110 m
B) 55 m 
C) 77 m
D) 220 m
Solution:
Ans: (d) 

Slant height of a cone: ( l ) = √(r2 + h2)

 = √(142 + 482) 

 = √196 + 2304

 = √2500

 l = 50 m

Lateral surface area of a cone = πrl

=\(\cfrac{22}{7}\times 14\times50\)= 2200 m2

Hence length of cloth= \(\cfrac{2200}{10}\)

= 220 m


Knowledge Expert

· commented

· 1 Months ago

Dear student
Given answer is correct
50 is the slant height
Ex- (L)^2 = (R)^2 + (H)^2
= (14)^2 + (48)^2
= 196 + 2304
= 2500
= 50
and Follow the solution

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