Angles on a straight line
for 5th grade
Use the fact that angles on a straight line sum to 180° to find the missing angle x
Calculate angles on a straight line
Angles on a straight line always add up to 180°. So, if we know what one angle is, we can work out the second angle. Angles that add together to make a straight line are called supplementary angles. A straight line or an angle on a straight line has an angle of 180°.
In this topic you are given diagrams of angles on a straight line where an angle x is not given a value. In each instance you are required to calculate angle x from the information provided.
For instance, question 1 shows a straight line intersected by a another line. One of the angles between the straight line and the other line is marked as being 150°. The other angle is marked x. We can easily work out the size of angle x by subtracting 150 from 180. So angle x is 30°.
Below is a table showing the first 6 question answer pairs for the topic "Angles on a straight line" as used in the lessons for this topic. Our games and tests for the topic use these 6 items plus 10 additional question answer pairs.
The topic "Angles on a straight line" is in the category Shapes for 5th grade (ages 10 to 11).
Revise 'Angles on a straight line' with one of our games for 5th grade
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