Question

Find the value of x.
140°
10x
O A. 18
O B. 4
C. 14
D. 9

Answer 1

That is a supplementary angle which means it adds up to 180 degrees.

So first you would subtract what you already know

180 - 140 = 40


Now to find the other angle, you’d need to do the equation

10x = 40

X= 4


Hope this helped :)