What is vertical?

We explain how primary-school children are taught to recognise vertical lines in shapes, and what you can to to support your child's understanding at home.
What is vertical?
A vertical line is a line that runs up and down the page, like the following:


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Children are introduced to vertical lines in Year 3. They may be asked to recognise them in a shape, for example:
How many vertical lines does this shape have?
(The answer is 4.)
When learning about shapes children are also taught to look for horizontal, perpendicular, parallel and diagonal lines.