Angles on One Side of a Straight Line
Angles on one side of a straight line will always add to 180 degrees. If a line is split into 2 and you know one angle you can always find the other one.
If we know one angle is 45° what is angle a
Angle a will be 180° − 45° = 135°
This method can be used for several angles on one side of a straight line.
In this diagram angle b is simply 180° take away the sum of the other angles.
Sum of known angles = 45° + 39° + 24°
Sum of Known angles = 108°
Angle b = 180° − 108°
Angle b = 72°
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