Question

The curved surface area of a cone is 308 sq.cm, and its radius is 7 cm. Find
the total surface area of the cone.​

Answer 1

Step-by-step explanation:

......................

Answer 2

The total surface area of the cone = 462 $cm^{2}$

Step-by-step explanation:

Given,

The curved surface area of a cone = 308 $cm^{2}$ and

The radius of a cone = 7 cm

To find,  the total surface area of the cone = ?

We know that,

The total surface area of the cone = The curved surface area of a cone + The base area of a cone

= $\pi rl+\pi r^2$

= 308 + $\dfrac{22}{7} \times 7^2$ $cm^{2}$

= 308 + $22 \times 7$ $cm^{2}$

= 308 + 154 $cm^{2}$

= 462 $cm^{2}$

Thus, the total surface area of the cone = 462 $cm^{2}$