Shapes And Angles

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

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

Obtuse Angles More than 90 degrees Less than 180 degrees

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

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

Using a Protractor

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.

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

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?

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.

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.

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

What does it measure? This angle measures 35°.

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