Mathematics A-Level
Geometrical proofs
What Geometrical proofs means in Mathematics A-Level, as defined for Pearson Edexcel.
Definition of Geometrical proofs
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Reference: Pearson Edexcel
Proofs of the addition formulae using stacked right-angled triangles, where a triangle with angle B sits on the hypotenuse of one with angle A, and resolving sides derives sin(A + B) and cos(A + B).
Topics that use Geometrical proofs
- Trigonometry (Pearson Edexcel A-Level)
Related terms
- Arcsin, arccos and arctan
- area of a triangle
- Asymptotes
- Domain
- Domains of reciprocal functions
- Equations involving multiples of the unknown angle
- Exact values
- Fundamental trigonometric identities
Using Geometrical proofs in the exam
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