You need to know the properties of the different types of triangle and square. Circles always have a radius, a diameter, and a circumference. You also need to know about other polygons such as hexagons and pentagons.
The perimeter is the length of the sides of a shape, and the area is the surface area that it covers. You need to know how to work out how many lines of symmetry a 2D shape has.
This section includes:
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