# Maths:Angles

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- Created by: Wunmi
- Created on: 29-10-10 15:11

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Angles

#### Angle facts

An angle is formed where two straight lines meet. We measure them in degrees and there are**360 degrees**in a full circle.

**We can use the following facts to work out angles we don't know:**

**1.**Angles around a single point add up to 360^{0}.

**2.**Angles on a straight line add up to 180^{0}. So the missing angle below must be 40^{0}.

**3. Vertically opposite **angles are equal. (This is when two straightlines**cross!**).

**4.**Angles in a triangle add up to 180^{0}. (See**'Polygons'**).

**5.**Angles in a quadrilateral add up to 360^{0}. (See**'Polygons'**).

#### Parallel lines

**When a straight line crosses two parallel lines there are more angle factswe can look for and use!**

**1. Corresponding angles**are equal - these are angles in a letter 'F'.

**2. Alternate angles**…

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