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EDEXCEL GCSE FOUNDATION MATHS - What are Angles in a Triangle

Author Zak  |  Date 2024-10-21 20:01:45  |  Category Maths
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Edexcel GCSE Foundation Maths: Angles in a Triangle

What are angles?

An angle is a measure of the amount of turn between two lines that meet at a point. It's measured in degrees (°).

Example:

  /
 / |
/  |
-----

The angle between the two lines is represented by the symbol ?.

Angles in a triangle

A triangle is a closed shape with three straight sides and three angles. The sum of all the angles inside a triangle always adds up to 180°.

Example:

     A
    / \
   /   \
  B-----C

In triangle ABC:

?A + ?B + ?C = 180°

Types of angles in a triangle:

Finding missing angles in a triangle:

If you know two angles in a triangle, you can find the third angle by using the following formula:

Missing angle = 180° - (known angle 1 + known angle 2)

Example:

     A
    / \
   /   \
  B-----C

If ?A = 60° and ?B = 80°, then:

?C = 180° - (60° + 80°) = 40°

Key takeaways:

Remember to practice using this knowledge to solve problems in your Edexcel GCSE Foundation Maths course!