Surface Area Visually - Net of a Cone
This applet unwraps the cone to show the net and from there we can make a connection to the formula for the Surface Area.
The tricky part of this shape is the slant . We need to use Pythagorean Theorem to find it, so watch out!
Notice how the slant is shown when the net is open.
Checking in
Set the height to 5 and the radius to 3.5 and let's assume units are cm. What is the surface area for this cone?