Question

Answer the following:
6. A solid right circular cylinder has radius 7 cm and height 20 cm. Find its
(i) Curved surface area
(ii) Total surface area​

Answer 1

Answer:

Let r and h be the radius and height of the solid right circular cylinder respectively

Given that r=7cm and h=20cm

Curved surface area, CSA=2πrh

=2×

7

22

×7×20

Thus,the curved surface area =880sq.cm

Now, the total surface area =πr[h+r]

=2×

7

22

×7×[20+7]=44×27

Thus, the total surface are =1188sq.cm

Step-by-step explanation:

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Answer 2

Answer:

Given,

Radius=7 cm, Height=20 cm.

i)CURVED SURFACE AREA= 2×pie×r×h

=2×22/7×7×20 = 880 cm sq.

ii)TOTAL SURFACE AREA = 2×pie×r(r+h)

=2×22/7×7(7+20)

= 44×27=1188 cm sq..

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