The net of a 3D shape is what it looks like if it is **opened out flat**. A net can be folded up to make a 3D shape.

]]>- The area of a 2D shape is the
**amount of surface it covers**. - The units for area are cm2 (square centimetres), m2 (square metres) or km2(square kilometres).
- To work out the area of a rectangle, multiply its length (the longer side) by its width (the shorter side):
**area = length × width** - The area of this rectangle is 6 x 4 = 24 cm2:

- The perimeter is the
**distance**all the way around the**outside**of a 2D shape. - To work out the perimeter,
**add up the lengths of all the sides**.

The perimeter of this shape is 5 + 5 + 10 + 10 = 30 cm:

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.

Triangles have three sides. There are many different types of triangles:

Quadrilaterals have four sides. Here are some special quadrilaterals:

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