The measure of an angle which is four times its supplement is________.

Let us assume the angle is x.

Then, its supplement angle = (180^o – x)

As per the condition given in the question, x = 4 (180^o – x)

x = 720^o – 4x

x + 4x = 720^o

5x = 720^o

x = $\frac{{720}^0}{5}$

x =144^o