1. Shapes And Angles

2. What cute little angles!
Acute Angles
What cute little angles!
Less than 90 degrees

3. What’s so right about these?
Right Angles
What’s so right about these?
They just look like square corners to me!
90 degrees!

4. Obtuse Angles
More than 90 degrees
Less than 180 degrees

5. 360 degrees Full Turn 4 right angles 4 lots of 90 degrees
How many ways do I have to say it?

6. Everyone knows this is 180 degrees!
Straight Line
Everyone knows this is
180 degrees!

7. Using a Protractor

8. Measuring, calculating and drawing angles...
learning objectives
To use a protractor to:
measure acute and obtuse angles to the nearest degree.
draw acute and obtuse angles to the nearest degree.
To calculate angles on a straight line.

9. What do we use to help us while measuring angles?
A protractor
Here is a standard protractor

10. When we use a protractor, we need to line it up correctly.
You need to make sure the protractor is lined up correctly.
Is this ready to measure the angle?

11. Were you right?......................it wasn’t
Look for the upside down ‘T’ in the middle of the straight line on your protractor.
This needs to be exactly on the vertex of your angle.

12. We need to remember..... It doesn’t matter which way round the
angle is, you
ALWAYS need
to line the upside
down ‘T’ to the vertex
of the angle.

13. Now you are ready.
Read from the 0°, and follow the inner set of numbers.

14. What does it measure?
This angle measures 35°.

15. Investigating Right Angles
Challenge!
Investigating Right Angles
Sort the quadrilaterals into a table like this.
0 right angles
1 right angle
2 right angles
3 right angles
4 right angles B A C D E H F G