Circles and PiCone Surface

Finding the surface area of a cone is a bit more tricky. Like before, we can unravel a cone into its net. Move the slider to see what happens: in this case, we get one circle and one circle sectorcircle segmentcircle arc.

Now we just have to add up the area of both these components. The base is a circle with radius r, so its area is

ABase= .