Question

Please answer question no 12.

Answer 1

Answer:

6m

Step-by-step explanation:

Find Height of the cylindrical pillar

Curved Surface area of Cylinder = 2$\pi$rh

264 = $2 * \frac{22}{7} * r * h$

⇒ r * h = $\frac{(264 * 7)}{44}$

⇒ r * h = $\frac{1848}{44}$

⇒ r *  h = 42

⇒ h = $\frac{42}{r}$ ---------> (1)

Find Radius

Volume of Cylinder = $\pi r^2h$

924 = $\frac{22}{7} * r^2 * \frac{42}{r}$

924r = 924 * 7

r = 7 m

Final Result

Diameter  = 2 * radius

=> 2 * 7

=> 14 m

Since , radius = 7 m put the value of r = 7 in eq (1)

h = $\frac{42}{7}$

h = 6 m

Therefore , the diameter of the pillar is 14 m . Hence , option (D) is Correct