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Talking Maths
A 2D shape is symmetrical if a line can be drawn through it and either side is a reflection of the other.
The line is called a line of symmetry.
This is sometimes called a 'mirror line' or 'mirror symmetry', because if you put a mirror on the line, the reflection would show the whole shape.
Let's look at this problem together.
Explain to your partner which 2 shapes have no line of symmetry and how you know.