Mathematics A-Level
CAST diagram
What CAST diagram means in Mathematics A-Level, as defined for WJEC.
Definition of CAST diagram
Check what you remember
Read the wording for your board, then hide it and explain CAST diagram in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: WJEC
The four quadrants determining signs: all ratios positive in Quadrant 1, only sine in Quadrant 2, only tan in Quadrant 3, only cos in Quadrant 4.
Topics that use CAST diagram
- Trigonometry (AS Unit 1: Pure Mathematics A) (WJEC A-Level)
Related terms
- area of a triangle
- cosine rule
- equation solving
- factorisation
- multiple-angle equations
- periodic solutions
- principal value
- trigonometric definitions
Using CAST diagram in the exam
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