Answer:
A. 40 degree+ 90 degree = x
The sum of the angles = 130 degree
Step-by-step explanation:
[tex]Given:\:\:\angle RSV = 40\degree,\:\:\angle VST = 90\degree\\\because \angle RSV + \angle VST = \angle RST\\\therefore 40\degree + 90\degree = x[/tex]
x = 130 degree
