Question

Find the surface area of a cone with a radius of 8 cm and a slant height of 17.9 cm round to the nearest tenth

Answer 1

Step-by-step explanation:

Given that,

Radius of cone, r = 8 cm

Slant height of the cone, l = 17.9 cm

We need to find the surface area of a cone. The a cone, its surface area is given by :

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

Putting the values of r and l in above formula such that,

$A=\pi (r^2+rl)\\\\A=\dfrac{22}{7}\times ((8)^2+8\times 17.9)\\\\A=651.2\ cm^2$

So, the surface area of a cone is $651.2\ cm^2$. Hence, this is the required solution.