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Maths
Summary
2D shapes are flat shapes that are sometimes called plane shapes. There are many different types of 2D shapes. Regular polygons have equal side lengths and equal angles.
Polygons are straightsided shapes. Regular polygons have sides of equal length, and equal angles. Irregular polygons have at least one side or angle that is different in size. Below is a table that shows the names of different shapes depending on how many sides they have:
shape name  number of sides  Diagram 
Triangle  $3$  
Quadrilateral  $4$  
Pentagon  $5$  
Hexagon  $6$  
Heptagon  $7$  
Octagon  $8$  
Quadrilaterals are foursided shapes. There are a number of different types of quadrilateral:
shape name  properties  diagram 
Square 
 
Rectangle 
 
Rhombus 
 
Parallelogram 
 
Trapezium 
 
Kite 

A triangle is a 2D plane shape with three straight sides and three angles. There are four types of triangle:
SHape name  properties  diagram 
Equilateral triangle 
 
Isosceles triangle 
 
Scalene triangle 
 
Rightangled triangle 
 
A circle is a shape made up of all points in a plane that are a fixed distance from the centre. There are a number of properties of a circle:
Note: The diameter of a circle is twice the radius.
FAQs
Question: What is the circumference of a circle?
Answer: The circumference is the length of the outside edge of a circle.
Question: What is a triangle?
Answer: A triangle is a 2D plane shape with three straight sides and three angles.
Question: What is a circle?
Answer: A circle is a shape made up of all points in a plane that are a fixed distance from the centre.
Question: What is a polygon?
Answer: A polygon is a straightsided 2D (plane) shape.
Question: What is the name for a foursided shape?
Answer: The name for a foursided shape is a quadrilateral.
Theory
Exercises
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