Question

If external radius of a cylinder is 14 cm and its height is 7 cm its total surface area will be -
i. 1848 cm2
ii. 2848 cm2
iii. 1948 cm2
iv. 2984 cm2​

Answer 1

Answer:

Correct option is A)

Diameter=2r = height =h

2r=h −−−−−−−−−(i)

Total surface Area =2πrh+2πr

2

put h=2r

1880=4πr

2

+2πr

2

r

2

=

6π

1880

=

6×22

1880×7

r

2

=9.98 cm

r≃10cm

Answer 2

Answer:

T.S.A = 2πr(h+r)

=2×22/7×14(7+14)

=2×22×2(21)

=88×21

=1848