Estimate, measure and compare angles using degrees. Construct angles using a protractor (ACMMG112)
LO: To estimate, measure and compare angles using degrees.
To construct angles using a protractor.
Know:
- That angles are measured using degrees.
Understand:
- That angles can be measured using degrees
- That angles can be constructed using a protractor.
Do:
- I can draw and measure angles using a protractor.
A right angle always adds up to 90 degrees. So all 90 degree angles are right angles. You can always tell that angles are right angles if they have a little square between the arms of the angle.
Anything less than (smaller) a 90 degree angle is called an acute angle.
If the angle is larger (bigger) than a 90 degree angle, then the angle is called an obtuse angle.
If the angle is a lot larger (bigger) than a 90 degree angle, then the angle is called an reflex angle.
In Maths, we use a protractor to help us draw angles. Notice how a protractor has 2 sets of numbers (inside and outside). This is where you have to think in order to determine which set of numbers you are going to use.
Teaching Ideas
Interactive Protractor
