Question

curved surface area of a cylinder of radius 5 centimetre is 25 1.2 square cm find its height ​

Answer 1

Answer:

Given

r= 5

CSA of cylinder= 2πrh

h=?

CSA is 251.2

then h is ,

$2\pi \times 5 \times h = 251.2$

$h = \frac{251.2}{31.4285} = 7.992$

h= 7.992cm

approx to 8

proof:

$2 \times \frac{22}{7} \times 5 \times 7.992 = 251.2$

Answer 2

The height of a cylinder (h) =  8 cm

Step-by-step explanation:

Given,

The curved surface area of a cylinder = 25.12 $cm^{2}$ and

Radius (r) = 5 cm

To find, the height of a cylinder (h) = ?

We know that,

The curved surface area of a cylinder = $2\pi r h$

∴ 2 × 3.14 × 5 × h = 251.2

⇒ 31.4h = 251.2

⇒ h = $\dfrac{251.2}{31.4}$

⇒ h = 8 cm

∴ The height of a cylinder (h) =  8 cm