11.05 Angles on a straight line
Lesson
Are you ready?
Do you remember how many degrees are in a full turn? Let's try this problem to review.
How many $1^\circ$1° angles fit into a full circle?
Learn
A straight line is half of a full turn, so it has a measure of $180$180 degrees.
This also means that angles on a straight line will add up to $180$180 degrees.
Let's learn more about angles on a straight line.
Apply
Find the size of the missing angle.
$=$= $\editable{}$$^\circ$°
Remember!
Angles on a straight line always add up to $180$180 degrees.