What is the total surface area of a cone whose radius is 24 cm and height is 10 cm?

Correct option is C

Given:
Radius (r) = 24 cm
Height (h) = 10 cm
Total Surface Area = ?
Formula Used:
Total Surface Area of Cone = $$\pi r (r + l)$$​​
where $$l = \sqrt{r^2 + h^2}$$​ (slant height)
Solution:
​$$l = \sqrt{24^2 + 10^2}\\l = \sqrt{576 + 100} = \sqrt{676} = 26$$​​
​$$\text{Total Surface Area} = \pi \times 24 \times (24 + 26) \\= \pi \times 24 \times 50 = 1200 \pi\\\text{Total Surface Area} = 1200 \times \frac{22}{7} \approx 3771.43 \, \text{cm}^2\\$$​​