Question

Which revolution will generate this hemisphere?

Rotate a semicircle 180° about its diameter.
Rotate a circle 180° about a diameter.
Rotate a trapezoid 180° about one of its bases.
None of the other answers are correct
Rotate a rectangle 180° about one of its sides

Answer 1

Rotate a semicircle 180° about its diameter

Explanation:

For common figures, the shape of a figure that revolves about a line which is at the base of the figure to give a 3 dimensional shape is the shape of the cross section of the 3 dimensional figure when the angle of revolution is 180° and half the shape of the cross section of the formed 3 dimensional figure, when the angle of revolution is 360°

The cross section of an hemisphere is a semicircle, therefore, the shape of an hemisphere is formed by rotating a semicircle 180° about the diameter (which is the straight line at the "base") of the semicircle

Therefore;

The correct option that gives the revolution that will generate the hemisphere is;

Rotate a semicircle 180° about its diameter.