Question

9. A wooden article was made by scoopingout a hemisphere from each end of a solidcylinder, as shown in Fig. 13.11. If theheight of the cylinder is 10 cm, and itsbase is of radius 3.5 cm. find the total
surface area of the article.
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Answer 1

Answer:

Given that, 

Radius (r) of cylindrical part = Radius (r) of hemispherical part = 3.5 cm 

Height of cylindrical part (h) = 10 cm 

Surface area of article = CSA of cylindrical part + 2 x CSA of hemispherical part 

= 2 π r h + 2 x 2 π r2 

= 2 π x 3.5 x 10 + 2 x 2 π x 3.5 x 3.5 

= 70 π + 49π 

= 119 π 

= 17 x 22 = 374 cm2 

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Answer 2

Answer:

Step-by-step explanation:

Height of cylinder =10 cm

Radius of Base = 3.5 cm

Total surface of the article= curved surface of cylinder + 2 surface area of hemisphere .

2=2πRh+ (2$\pi$r)2

2$\pi$R (h+2 r)

2 x 22/7 x 3.5 (10 + 2 x 3.5 )2

=374cm2