Question

3. A toy is in the form of a cone of radius 3.5 cm mounted on a hemisphere of same radius,
The total height of the toy is 15.5 cm. Find the total surface area of the toy.​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

Total surface area of toy =  Curved surface area of cone +  surface area of hemisphere

Curved  surface area of cone = πrl

Where r=3.5cm, Height =15.5−3.5=12cm

And hence, l=12.5cm       (by using formula l  

2

=h  

2

+b  

2

)

Therefore C.S.A. of cone =π×3.5×12.5

=137.5cm  

2

 

Surface area of hemisphere =2πr  

2

 

=2×π×(3.5)  

2

 

=77cm  

2

 

Hence T.S.A of toy =77+137.5=214.5 cm  

2

Step-by-step explanation:

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