Modify | Transform | Rotate

This tool rotates curves or solids about a specified axis and by a specific degree of rotation. In the example below, the specific point of rotation is shown by the arrow. The angle of rotation is 45°.

Angle rotated about point shown by the arrow. Rotation angle is 45°

In the example below, the solid has been rotated 90 degrees about the X axis.

Solid rotated by 90° about the x-axis, shown by the arrow. Axis is displayed using View > Show Axis.

This tool is discussed and demonstrated in more detail here.