Given:
The radius = 4 cm, the slant height = 9 cm.
To find:
The surface area of the cone.
Solution:
It is known that the surface area of the cone is given by:
[tex]SA=\pi r(l+r)[/tex]
For the given question, we have r = 4 cm and l = 9 cm. So, the surface area is:
[tex]\begin{gathered} SA=3.14\times4(9+4) \\ =12.56(13) \\ =163.28cm^2 \end{gathered}[/tex]
Thus, the surface area of 163.28 square centimeters.
