Symmetry

Symmetry is an intuitive concept, but in geometry, it has a formal definition. Watch this lecture series and complete the interactive exercises.

1. The quadrilateral does not have rotational symmetry.

2. This is the completed table:

Rotation	Applies to the figure?
Rotational symmetry of $90^{\circ}$ about the origin	Yes/No
Rotational symmetry of $180^{\circ}$ about the origin	Yes/No

3. Of the choices, the circle has rotational symmetry about its center for magnitudes of $7^{\circ}, 45^{\circ}$ , $90^{\circ}, 210^{\circ}$ , and $355^{\circ}$ .

4. This is the completed table:

Rotation	Applies to the figure?
Rotational symmetry of $90^{\circ}$ about the origin	Yes/No
Rotational symmetry of $180^{\circ}$ about the origin	Yes/No