Line, Point and Rotational Symmetry

Front

What is a line of symmetry?

Back

A line of symmetry is a line that divides a shape into two identical parts that are mirror images of each other.

Front

How many lines of symmetry does a circle have?

Back

A circle has an infinite number of lines of symmetry.

Front

Which letters have line symmetry? A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z?

Back

The letters with line symmetry are A, H, I, M, O, T, U, V, W, X, Y.

Front

What is rotational symmetry?

Back

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

Front

How many degrees can a shape with rotational symmetry be rotated before it looks the same?

Back

The number of degrees depends on the shape; for example, a square has rotational symmetry at 90 degrees.

Front

Which letter has rotational symmetry? A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z?

Back

The letters with rotational symmetry are H, I, O, S, X.

Front

What is the difference between line symmetry and rotational symmetry?

Back

Line symmetry involves a line dividing a shape into mirror images, while rotational symmetry involves rotating a shape around a point and it looks the same.

Front

Can a shape have both line and rotational symmetry? Give an example.

Back

Yes, a square has both line symmetry (4 lines) and rotational symmetry (90 degrees).

Front

What is an example of a shape with no lines of symmetry?

Back

An example of a shape with no lines of symmetry is a scalene triangle.

Front

How do you determine the number of lines of symmetry in a shape?

Back

To determine the number of lines of symmetry, you can fold the shape along potential lines and see if both halves match.