Line and Point Symmetry

Front

What is line symmetry?

Back

Line symmetry (or reflectional symmetry) occurs when a figure can be divided into two identical halves that are mirror images of each other along a line.

Front

What is point symmetry?

Back

Point symmetry (or rotational symmetry of order 2) occurs when every part of a figure has a matching part at an equal distance from a central point, such that the figure looks the same when rotated 180 degrees.

Front

Give an example of a figure having no line of symmetry but having rotational symmetry.

Back

Parallelogram.

Front

How many lines of symmetry does a square have?

Back

A square has 4 lines of symmetry.

Front

How many lines of symmetry does a circle have?

Back

A circle has an infinite number of lines of symmetry.

Front

How many lines of symmetry does a triangle have?

Back

An equilateral triangle has 3 lines of symmetry.

Front

Which letter has point (rotational) symmetry? A, S, T, W

Back

S.

Front

Which letter does NOT have symmetry? G, H, O, E

Back

G.

Front

How many lines of symmetry does a rectangle have?

Back

A rectangle has 2 lines of symmetry.

Front

What is rotational symmetry?

Back

Rotational symmetry occurs when a figure can be rotated around a central point and still look the same at certain angles.