Question

Consider a cylinder whose radii is 7 cm and height is 20 cm.
Find the curved surface area.

880 cm2

890 cm2

920 cm2

935 cm2
Find the total surface area.

1180 cm2

1184 cm2

1188 cm2

1120 cm2

Answer 1

Answer:

Let r be the radius of the cylinder  

and h be the height of the cylinder.

Given curved surface area of cylinder = 1760cm  

2

 

2πrh=1760

⇒r=  

2rh

1760

​  

 -----(1)

and volume of the cylinder = 12320cm  

2

 

⇒πr  

2

h = 12320

⇒π(  

2πh

1760

​  

)  

2

h=12320

⇒π(  

Aπ  

2

h  

2

 

(1760)  

2

 

​  

)×h=12320

⇒  

4πh

(1760)  

2

 

​  

=12320

⇒h=  

4π(12320)

(1760)  

2

 

​  

 

⇒h=  

28π

1760

​  

                   

⇒h=  

88×22

1760×7

​  

            [using π=  

7

22

​  

]

⇒ h=20 cm.

Hence height of cylinder =20 cm

Answer 2

Answer:

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