Question

Find TSA of CSA 400cm2

Answer 1

Answer:

TSA of cylinder =2πrh+2πr

2

CSA of cylinder =2πrh

Volume of cylinder =πr

2

h

Now,

TSA

CSA

=

2

1

(Given)

∵TSA=616cm

2

(Given)

∴CSA=

2

1

×616

⇒CSA=308cm

2

Now,

TSA=CSA+2πr

2

616−308=2πr

2

⇒r

2

=

22×2

308×7

=49cm

2

⇒r=7cm

Also,

2πrh=2πr

2

=308cm

2

⇒2πrh=2πr

2

⇒r=h

Therefore,

Volume of cylinder =πr

2

h

=

7

22

r

3

(∵r=h)

=

7

22

×(7)

3

=1078cm

3

Answer 2

Answer:

LSA=400CM^2

=LSA=4×A^2

A^2=400/4

A^2=100

A^2=(10)^2

TSA=6Aa^2

6×(10)^2

6×100

600CM^2

Volume=a^3

VOL^3

=1000CM^2