Question

the volume of a cylinder is 5346 cm cube and its height is 21 cm find its radius and hence its curved surface area

Answer 1

Answer:

Step-by-step explanation:

Volume =5346 centimetre cube

Height =21cm

Volume of a cylinder = π (pie) r2 h

22/7×r2×21=5346

r2=5346×7÷22×21

Cancel 7and21 you will get 3

Cancel 5346and22 you will get 243

Cancel 243and3 you will get 81

So,r2=81

r=9

CSA=2π r h

2×22/7×9×21

Cancel 7and21 you will get 3

2×22×9×3

44×27= cm square

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Answer 2

Answer:

The radius is 9cm and the CSA is 1187.5$cm^{2}$

Step-by-step explanation:

Given that volume of the cylinder is 5346$cm^{3}$ and the height(h) is 21 cm.

We know that the volume of a cylinder is $\pi r^{2} h$

this implies that $\pi r^{2} h = 5346$ we have the value of height on substituting we will obtain the radius as r = 9cm.

Now the Curved Surface Area is $2\pi rh$ on substituting the values of r and h we will obtain 1187.5 $cm^{2}$.