Question 810
Surface area of cone is = (PI)*R*S + (PI)*R^2, where R- radius, S- Slant height.

Slant height can be found using Pythagorean Theorem, where you know the height, and radius. Then slant height will be hypotenuse.
there fore s= sqrt( h^2 + r^2) = 5

Surface area = 75.43

If it doesn't haVE CIRCULER LID, THEN NO NEED TO CONSIDER  (PI)*R^2