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GCSE Mathematics · key term
An angle of exactly .
Used by AQA, Edexcel and OCR
Specification G1 · Paper 1, Paper 2, Paper 3
An angle measuring exactly . It is conventionally marked by a small square at the vertex.
Revise: Properties of Polygons and SymmetryTwo lines that meet at a right angle are perpendicular, but the focus here is the angle itself. An angle which merely looks square is not necessarily a right angle; there must be a marking, a measurement or enough stated information to prove it.
Specification G3 · Paper 1, Paper 2, Paper 3
An angle of 90°, formed where two lines meet perpendicularly.
Revise: Basic Angle Facts and Vertically Opposite AnglesLines that meet at a right angle are perpendicular.
Specification 8.01b, 8.05c · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
An angle of exactly 90°, equal to a quarter turn.
Revise: Angle TerminologyA right angle is a quarter turn, exactly 90°, and is often marked by a small square. An acute angle is smaller than a right angle: for example, 40°. An obtuse angle is larger than a right angle but smaller than a straight angle of 180°: for example, 120°.
Do not decide that an angle is a right angle merely because it looks like one. Use a stated angle or the small square marking.
The right angle is at the point on the circumference, opposite the diameter. Do not assume that an angle at either end of the diameter is .
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