Method 1: Use the CONE tool. Ideal for upper elementary and middle school students.
Method 2: Use CIRCLE and EXTRUDE TO PYRAMID tools. Ideal for upper elementary and middle school students studying properties of pyramids & cones.
Method 3: Create a SEGMENT connecting (0,0,H) and (R,0,0). Then use the SURFACE command to create a surface of revolution by rotating this segment fully about the zAxis. Ideal for geometry students studying cross sections and surfaces of revolution.
Method 4: Use PARAMETRIC EQUATIONS to build the cone via GeoGebra's SURFACE command. Ideal for students studying parametric equations. Note first parameter = u (goes from 0 to 1). Note second parameter = v (and goes from 0 to SPIN).
Quick (Silent) Demo in Augmented Reality. For this cone shown, H = 2R.