Types of Angles
(KS2, Year 6)

There are different types of angle. Angles can be:

• Acute
• Right
• Obtuse
• Straight
• Reflex
• Full

Acute Angles

An acute angle is an angle of less than 90°.

Right Angles

A right angle is an angle of 90°. Don't forget: Right angles are often denoted by adding a small right angle that forms a square with the angle.

Obtuse Angles

An obtuse angle is an angle greater than 90° and less than 180°.

Straight Angles

A straight angle is an angle of 180°.

Reflex Angles

A reflex angle is an angle greater then 180° and less than 360°.

Full Angles

A full angle is an angle of 360°.

Interactive Widgets

Try our bucket game or our drag-and-drop game to help you learn about the types of angles.

What Is an Angle?

An angle is created by two rays that have a common end point, called the vertex.

Who Classified Angles?

Euclid classified angles in his book, Elements. Definition 10: "When a straight line standing on a straight line makes the adjacent angles equal to one another, each of the equal angles is right". Definition 11: "An obtuse angle is an angle greater than a right angle". Definition 12: "An acute angle is an angle less than a right angle".

Oblique Angles

Acute and obtuse angles are also oblique angles. Oblique angles are neither right angles nor multiples of right angles.

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