In the figure, m<4 is an exterior angle to VAUL
Explain why m<4 is equal to the sum of the measures of the two nonadjacent interior angles.
https://snag.gy/fysTvJ.jpg
Answered here :
https://web2.0calc.com/questions/in-the-figure-lt-4-is-an-exterior-angle-to-vaul_1