Question:
The measure of an angle is twice the measure of its supplementary angle. Find the measure of the angles?
Solution:
Let the angle in case be 'x'
The supplementary of a angle x is (180 - x)°
Applying given data:
x = 2 (180 - x)
x = 360 - 2x
3x = 360
x = 360/3
x = 120
Therefore the value of the angle in case is 120°