1. 10/10/12
Angle Rules
WALT: familiarise ourselves with angle rules and use them to solve problems.
S1: Answer in your books:
What are parallel lines? (Draw a diagram).
What are perpendicular lines? (Draw a diagram).

2. There are three types of angles...
Facts:
There are three types of angles...
Lets have a quick practise...
Obtuse
Acute
Reflex

3. Angles on a straight line add up to...
Rule 1:
Angles on a straight line add up to...
180 degrees.

4. Angles around a point add up to....
Rule 2:
Angles around a point add up to....
360 degrees.

5. Angles in a triangle add up to...
Rule 3:
Angles in a triangle add up to...
180 degrees.

6. Angles in a quadrilateral add up to...
Rule 4:
Angles in a quadrilateral add up to...
180 degrees.

7. Complete the true/false task in front of you.
Organise them on a spare part of your desk, when you are confident and have discussed with your partner, stick them into your books in table form.

8. True False A reflex angle is between 90˚ and 180˚
An acute angle is less than 90˚
The interior angles of a triangle add up to 180˚
Angles around a point add up to 180˚
There are 180˚ in a straight line
An isosceles triangle has 3 equal sides and 3 equal angles.
Each angle in an equilateral triangle measures 60˚
Intersecting lines are lines that never cross each other.
Parallel lines are lines that cross each other.
If you know all the angles that are in a triangle, you can draw the exact triangle.
Parallel lines are marked with arrows.
Equal lines are marked with dashes.
Quadrilaterals have 4 sides.
The interior angles of a quadrilateral add up to 180˚
A square is a regular quadrilateral.
An obtuse angle is between 90˚ and 180˚
Right-angled triangles have two sides that are the same length.
Triangles have at least one angle that is a reflex angle.
True
False
Angles around a point add up to 360˚

9. P1
Reflect:
What facts did you get wrong and what can you do to help you remember them from now on?

10. Find the missing angles using the rules.
Task 2:
Find the missing angles using the rules.
15o
27o a

11. Are you able to use angle rules to find missing angles?P2
Reflect:
Are you able to use angle rules to find missing angles?