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Geometry & MeasuresLow Exam FrequencyAQAEdexcelOCRWJEC

Area of Triangle (Trig)

Revise Area of Triangle (Trig) in Geometry & Measures for GCSE Mathematics with 12 exam-style questions and 2 flashcards. This topic appears less often, but it can still pick up marks when it appears in mixed-topic papers.

Study this topic

1

No Height? No Problem!

Introduction2

The Formula

Key Facts3

Worked Example

Notes

Sample Flashcards

Area with Trig
Area = ½ab sin C
Trig Area Formula
Area = (1/2)ab sinC. The angle MUST be between the two sides you're using.

Sample Questions

What is the trigonometric formula for the area of a triangle with sides a and b and included angle C?

  • A. Area = ab sinC
  • B. Area = ½ab sinC
  • C. Area = ½ab cosC
  • D. Area = ½(a + b) sinC
1 markfoundation

Starting from Area = ½ × base × height, show how to derive the formula Area = ½ab sinC.

2 marksstandard

12

exam-style questions

2

revision flashcards

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