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Listed under:  Mathematics  >  Measurement  >  Units of measurement  >  Angle units  >  Degrees (Angles)
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How do you measure angles?

See how to use a protractor to measure angles. Watch how the correct placement of the protractor and reading the scale help to ensure accuracy.

Moving Image

Daredevil geometry

What does a daredevil jumps rider need to know about geometry? Find out as we discover angles for take off and for landing. But before we do that sit down for some angles basics! A good place to start is angles of turn through a circle from a 1/4, 1/2, 3/4, all the way to one full turn. See how many each represents as an angle.

Teacher resource

TIMES Module 25: Measurement and Geometry: trigonometric functions - teacher guide

This is a 21-page guide for teachers. It provides an introduction to the sine, cosine and tangent functions and applications of these.

Interactive Resource

BBC Bitesize: angles

This interactive resource defines the term 'angle' and the types of angles (acute, right, obtuse and reflex) as well as the angle sum of a triangle and a quadrilateral. Worked examples with a voice-over and optional subtitles are provided. Opportunity is given to students to try examples of each type, with immediate feedback ...


BBC Bitesize: angles - revision

This set of illustrated information sheets summarises facts related to angle types, measuring and estimating the size of angles, and the angle sum of triangles and quadrilaterals. Students are given the opportunity to try examples. Worked solutions are available. This resource is one of a series of online resources from ...

Interactive Resource

Angles (estimating angle size)

This is a six-page HTML resource about solving problems involving estimating angle size. It contains one video and three questions, two of which are interactive. The resource discusses and explains solving problems to reinforce students' understanding.

Interactive Resource

Angle estimator

This is an interactive resource containing two activities about estimating and measuring angles. In the angle estimation activity, users can select acute, obtuse or reflex angles, or any angle between zero and 360 degrees. In the angle drag activity, one arm of the angle can be dragged to rotate around the vertex, creating ...

Teacher resource

Angles - measurement, construction, estimation

This is a website designed for teachers and students in year 5, and addresses the topic of angles. It contains material on the vocabulary used when dealing with angles, and introduces the measurement and construction of angles using a protractor. There are pages for both teachers and students. The student pages contain ...

Interactive Resource

Free protractor

This iPad app is a digital 180-degree protractor. Angles can read from the right or left of the perpendicular, and acute and obtuse angles are shown in different colours. Angles can be set by moving the pointer or using the keyboard to enter the required degree of angle. The angle can also be locked when taking readings.


Mixed-Up Maths

Join our host, Ed, as he finds himself in all types of situations where only his knowledge of Maths can help him. From saving the planet from Aliens, to creating a superhero that can stop a strawberry milkshake tidal wave. From searching for buried treasure, to jumping like a daredevil, or planning the greatest circus party ...