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Monday 25th January 2021

LC- To investigate angles on a straight line.




Still image for this video

  We will now look at another example.

 Remember that all angles on a straight line add up to 180.


Also remember that a right angle is represented by a small square. It won't always tell you that it is 90 degrees.




So in this example, we have an angle that we already know. It is 45 degrees. We know that angles on a straight line add up to 180 degrees, so to find the missing angle we need to subtract 45 from 180.

The missing angle therefore, is 135 degrees.

The degrees symbol is a little circle on the top right of the numbers, like I drew in the video.


Now try the examples on Seesaw. There isn't a lot of space to show your working out so do that in your books and record the answers on Seesaw. The task is called, 'Straight line angles.'