SSC CPO 2024 PYQ — Question 117

The correct answer is Option 2 i.e. 462.

We know that,

The curved surface area of the cone = πrl

where, r = radius, l = slant height

⇒ l = $\sqrt{r^2+h^2}$

⇒ l = $\sqrt{21^2+28^2}$

⇒ l = $\sqrt {441+784}$

⇒ l = $\sqrt{1225}$

⇒ l = 35 m

Now,

⇒ CSA = πrl

⇒ 22/7 × 21 × 35

⇒ 22 × 3 × 35 = 2310 m²

Since the cloth is 5 meters wide, so 

Length of cloth required to cover the entire surface area = CSA/width of cloth

⇒ 2310/5 = 462 m

Thus, 462 meters of cloth will be required to make the conical tent