Lesson

Can you identify lines of symmetry in a shape? Look at the picture of a dog house below, is it symmetrical? Could you place a line through the picture so that the image on one side matches the image on the other?

If you can fold or cut a shape in half, and both sides look identical, we can say that shape has line symmetry. Let's learn more.

How many lines of symmetry does this painting have?

Worked Solution

Idea summary

If a shape is symmetrical, it means that when we draw a line through it, one side is identical to the other.

Some shapes or objects have more than one line of symmetry.

If you can spin or turn a shape or object part the way around, and it looks identical, we can say the shape has rotational video. Watch this video to learn more.

Which of the following shapes have rotational symmetry?

A

B

C

D

Worked Solution

Idea summary

Line symmetry means we can fold our image in half and it matches perfectly.

Rotational symmetry means there is at least one time where our shape looks identical, after turning it.

manipulates, classifies and draws two-dimensional shapes, including equilateral, isosceles and scalene triangles, and describes their properties