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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 straight-sided 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 | | ![]() |
Quadrilateral | | ![]() |
Pentagon | | ![]() |
Hexagon | | ![]() |
Heptagon | | ![]() |
Octagon | | ![]() |
Quadrilaterals are four-sided shapes. There are a number of different types of quadrilateral:
shape name | properties | diagram |
Square |
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Rectangle |
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Rhombus |
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Parallelogram |
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Trapezium |
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Kite |
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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 |
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Isosceles triangle |
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Scalene triangle |
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Right-angled triangle |
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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.
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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 straight-sided 2D (plane) shape.
Question: What is the name for a four-sided shape?
Answer: The name for a four-sided shape is a quadrilateral.
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