AQA · Mathematics · 8300
GCSE Maths: Angles: estimation
Geometry & Measures · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths practice questions for Angles: estimation (Corbettmaths Video 29), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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What is the size of a right angle in degrees?
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90°
What is an obtuse angle?
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An angle greater than 90° but less than 180°.
What is a reflex angle?
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An angle greater than 180° but less than 360°.
What is an acute angle?
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An angle greater than 0° but less than 90°.
What is the sum of three angles that meet at a point?
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360°
If you read the outside scale instead of the inside scale on a protractor when measuring an obtuse angle, what error occurs?
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You get the supplementary angle (the angle that adds to 180°). For example, reading 32° when it should be 148°.
When measuring angles with a protractor, a common error is reading the ? scale instead of the inside scale.
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outside
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