I need the surface area of a three dimensional cone. The base is 10 ft and the height is 24 ft. I got the volume but can't get the surface area can anyone help me to understand this and how I can get the correct answer please

Question

anonymous · Answer

SA=3.14rs +3.14r^2

anonymous · Answer

do you have the slant height?

anonymous · Answer

sorry I had to walk away but I'm back

anonymous · Answer

no I don't have the slant height

anonymous · Answer

okay well it's going to have a decimal but we can round

anonymous · Answer

would it be  LA=PI(5)(13)     LA=65PI

anonymous · Answer

$$S.A.= 3.14r \sqrt{r ^{2} + h ^{2}}$$

anonymous · Answer

if you substitute the numbers in you would get 24.51530134426253 and round 25 or to the tenth 24.5

anonymous · Answer

OK AND THANKS