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GCSE Mathematics · key term
The angle formed between two specified sides of a triangle.
Used by AQA, Edexcel and OCR
Specification G22, G23 · Paper 1, Paper 2, Paper 3
An angle formed by two given sides; it lies between those sides.
Revise: Sine and Cosine RulesThe cosine rule is useful when two sides and their included angle are known but there is no complete opposite pair for the sine rule.
The angle formed by the two sides being used in the area formula.
Check that the angle used is the included angle between the two chosen sides.
Make sure is the included angle between the two sides used as and .
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Specification G5, G23 · Paper 1, Paper 2, Paper 3
Revise: Congruence CriteriaWith SAS, the two side lengths and their included angle fix where both sides go. With ASA, the angles drawn at the ends of the known side fix where the remaining sides meet. In a right-angled triangle, the right angle, hypotenuse and another side likewise fix the remaining vertex.
The angle formed where the two sides used in the area formula meet.
Specification 6.02d, 9.02a, 9.02b, 9.04a, 10.03a, 10.05e · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
An angle formed by the two sides being used in a formula.
Revise: Standard Formulae ApplicationUse this rule when you know two sides and their included angle and need the third side, or when you know all three sides and need an angle.
The angle between two specified sides of a triangle.
The angle between the two sides being considered.
The angle formed by the two sides being compared in a side–angle–side argument.
The angle formed where two specified sides of a triangle meet.