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  •  A wooden article was made by scooping out a hemisphere from each end of a solid cylinder, as shown in Fig. 3. If the height of the cylinder is 10 cm and its base is of radius 3.5 cm. Find the total surface area of the article.  <im

 A wooden article was made by scooping out a hemisphere from each end of a solid cylinder, as shown in Fig. 3. If the height of the cylinder is 10 cm and its base is of radius 3.5 cm. Find the total surface area of the article. 

 

 

 
 
 
 
 

Answers (1)

Height of cylinder , h = 10 cm 

Base radius , r = 3.5 cm 

The total surface area of article = CSA of cylinder + CSA of 2 hemispheres 

= 2 \pi rh + 2 \times 2 \pi r^2 \\\\ = 2 \pi r (h + 2r ) \\\\ = 2 \times \frac{22}{7} \times 3.5 \times (10 + 2 \times 3.5 ) cm^2 \\\\ = 374 cm^2

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Safeer PP

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