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Geometry & MeasuresDeep Dive

Memory Tricks

Part of Exact Trig Values — GCSE Mathematics

This deep dive covers Memory Tricks within Exact Trig Values for GCSE Mathematics. Revise Exact Trig Values in Geometry & Measures for GCSE Mathematics with 14 exam-style questions and 4 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 3 of 6 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 3 of 6

Practice

14 questions

Recall

4 flashcards

Memory Tricks

1 Sin goes: 0, 1/2, √2/2, √3/2, 1 (pattern: √0/2, √1/2, √2/2, √3/2, √4/2)
2 Cos is sin BACKWARDS: 1, √3/2, √2/2, 1/2, 0
3 Tan = sin ÷ cos (use this to derive if you forget)

Keep building this topic

Read this section alongside the surrounding pages in Exact Trig Values. That gives you the full topic sequence instead of a single isolated revision point.

The Values You MUST KnowWorked Example 1The Special TrianglesWorked Example 2

Practice Questions for Exact Trig Values

What is the exact value of sin 30°?

  • A. √3/2
  • B. 1/2
  • C. √2/2
  • D. 1
1 markfoundation

James says that sin 30° and cos 60° are equal. Is James correct? Explain your answer using exact values.

2 marksstandard

Quick Recall Flashcards

Sin Pattern
sin 0°=0, sin 30°=1/2, sin 45°=√2/2, sin 60°=√3/2, sin 90°=1. Pattern: √n/2 for n=0,1,2,3,4
Cos Pattern
Cos is sin BACKWARDS. cos θ = sin(90°-θ). So cos 30° = sin 60°, etc.

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The Values You MUST Know

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Worked Example 1