A quadrilateral has four sides. It is two-dimensional (a flat shape), closed (the lines join up), and has straight sides. Examples of quadrilaterals include:
Perimeter is the distance around a two-dimensional shape.
It helps to imagine starting at a vertex and finding the distance to walk around the outside of the 2D shape.
Units: centimetres (cm) and metres (m)
Square Four sides are equal Opposite sides are parallel All angles are right angles (90°)
Rectangle Opposite sides (red sides, blue sides) are equal Opposite sides are parallel All angles are right angles (90°)
width
Area is the size of a surface.
It helps to imagine how much paint would cover the shape. Units: centimetres squared (cm2 metres squared (m2
When labeling a rectangle, e.g. ABCD, the letters must follow around the outside of the figure, in order. You can go clockwise or anti-clockwise, and you may start at any vertex point. A
B
The length of the line between A and B is shown as |AB| The length of the line between B and C is shown as |BC|