Irregular means that they do not have all sides the same length.Īny 2D shape with six corners or six sides is called a hexagon.Īgain the shape in the centre of this image is a regular hexagon because all of its six sides are equal. The name of the other shapes around the outside are irregular pentagons. The shape in the middle of the image is a regular pentagon because it has 5 sides that are all the same length. Pentagons are 2D shapes that have 5 corners and 5 sides such as any of the shapes in the image above. Often marked with a square drawn on the angle.Īny shape with five corners or five sides is called a pentagon. The name ‘square’ is only correct to use for a shape that has four equal sides, meaning that all of its sides are the same length.Ī rectangle has two pairs of opposite sides that are the same length.Įach side is the same length as the side that it is opposite to.Ī square is a special kind of rectangle that has all sides the same length. The only correct name to call all types of four-sided shapes is ‘quadrilateral’. When teaching 2D shape names to children, it is a very common misconception for them to say that the name of any four-sided shape is called a square. Two common types of quadrilaterals are squares and rectangles.Ī square has four sides that are the same length.

The correct name for any 2D shape with four sides is a quadrilateral.Ī quadrilateral is just the word we use for a four-sided shape. The 2D shapes below all have four corners and four sides. There are 360 degrees in a complete turn. Degrees The unit that we measure angles with.

2d shapes and names