Area-Of-A-Triangle- Wjec-Eduqas Higher

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Exam code:C300

Area of a triangle

How do I find the area of a non-right-angled triangle?

The area of any triangle can be found using the formula

$Area space equals space 1 half a b space sin space C$

C is the angle between sides $a$ and $b$

Non Right-Angled Triangle labelled with angles A, B and C and opposite corresponding sides a, b and c.

Label your triangle correctly
- Make sure that C is always the angle between the two sides
If angle C is 90°, you get a right-angled triangle
- sin 90° = 1 so the formula becomes the familiar “Area = ½ × base × height”!

Examiner Tips and Tricks

You are given the triangle area rule on the formula sheet

Worked Example

The following diagram shows triangle $ABC$ .

$AB space equals space 32 space cm$ , $AC space equals space 1.1 space straight m$ and angle <img alt=”BAC space equals space 74 degree” data-mathml=”<math ><semantics><mrow><mi>BAC</mi><mo> </mo><mo>=</mo><mo> </mo><mn>74</mn><mo>°</mo></mrow><annotation encoding=”application/vnd.wiris.mtweb-params+json”>{“fontFamily”:”Times New Roman”,”fontSize”:”18″,”autoformat”:true,”toolbar”:”<toolbar re

Maths Gcse Wjec-Eduqas Higher

Area-Of-A-Triangle- Wjec-Eduqas Higher