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Study Guide : Angles

Learner Guide



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An angle measures how far something has turned and it is measured in

degrees, which are symbolised with a little o sign after the number. We can

measure angles using an object called a protractor.


A full turn (coming back to the where you started from) is 360o.

A right angle is 90o and is one quarter of a full turn.



An angle which is less than a right angle (less than 90o) is called an acute




An angle which is more than a right angle but less than a straight line. (more

than 90o but less than 180o) is called an obtuse angle.


An angle which is greater than 180o is called a reflex angle.


All of the angles inside a triangle will always add up to 180o.


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Related Topics

symmetry-in-2d-shapes          3d-shapes                   calculators

properties-of-numbers         number-sequences       multiplication-calculations



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