find total surface area of the cone whose radius is r. by two and slant height is two l. units
The total surface area of a cone can be calculated using the formula:
Surface Area = π * r * l + π * r^2
Given that the radius is 2r and the slant height is 2l, we can substitute these values into the formula:
Surface Area = π * (2r) * 2l + π * (2r)^2
= π * 4rl + π * 4r^2
= 4πrl + 4πr^2
Therefore, the total surface area of the cone is 4πrl + 4πr^2.