Question

what is the angle of rotation of semi-circle,circle,rectangle and parallelogram

Answer 1

ANGLE OF ROTATION - A measurement of the amount, the angle by which a figure is rotated counterclockwise about a fixed point often the center of a circle.

360° - A rotational symmetry in which the point is moved about the objects and fit in itself more than once. This is a symmetry of order one.

Let n be the order of rotation for each shape, then

Angle of rotation =360°/n

Circle=infinite order

Rectangle =order2

Semicircle =order1

Parallelogram =order2

ANGLES OF ROTATION ARE

Circle=Infinity

Rectangle =360°/2=180°

Semicircle =360°/1=360°

Parallelogram =360°/2=180°

Answer 2

Angles -------------- Figure

180 degree semi circle
360 " rectangle
360" circle
360" parallelogram