- Angles that meet at a point add up to 360°
- Angles that meet at a point on a straight line add up to 180°
- Vertically opposite angles are equal
- Vertically opposite angles occur when two lines intersect
- They are the angles either side of the intersection that are opposite to each other

- The
**three**interior angles inside any triangle**add up to 180°** - If the triangle is
**isosceles**then**two angles will be equal** - These will be the two angles opposite the two sides of equal length
- If the triangle is
**equilateral**then the three angles will be equal - Each angle will equal
**60°**

- The
**four**interior angles inside any quadrilateral**add up to 360°** - If the quadrilateral is a
**square**or a**rectangle**then all the angles are equal - Each angle will equal
**90°** - You can use any symmetries of the quadrilateral to identify other equal angles
- For a
**parallelogram**or**rhombus****opposite angles**are**equal** - For a
**kite****one pair**of**opposite angles**are**equal**

- Find all the missing angles that you can using the angles that are given to you in a question
- They might not seem to help you straight away but having more angles will lead you to find the angle you need

The diagram below is formed by three straight lines. Find the value of .

Label the other missing angles inside the triangle.

Vertically opposite angles between two intersecting lines are equal.

Angles that meet on a straight line add up to 180°.

Interior angles in a triangle add up to 180°.

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