shapes of rotation
Shapes of rotation - it is the general name of the group of shapes. This name describes creating of shapes - 2d image rotates around an axis and the created figure has the appointed form. The axis of turn is located on the surface of a figure and it is the side of the rotating image.
Try to name shapes of rotation elements during the test - open the test and put names on the images noted by dots.
Presented shape isn't the simplest because it does consist of various parts. To distinguish these parts, we will get familiar with the simplest figures of rotation.