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Q.

Find the slant height of the cone if the radius of base is 3cm and height is 4cm.


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a

2cm

b

5cm

c

6cm

d

8cm 

answer is B.

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Detailed Solution

Given that radius of base is 3cm, height is 4cm.
So, r=3cm, h=4cm.
Now, slant height (l) is given by the formula,
l= r 2 + h 2 ⇒l= 3 2 + 4 2 ⇒l= 9+16 ⇒l= 25 ⇒l=5 cm  
Thus, the slant height of the cone is 5cm.
Therefore, option (2) is correct.
 
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