All the angles in a triangle add up to 180 degrees
40+90=130
180-130=50
The missing angle is 50 degrees
The answer is 3.375. Hope this helps. :D
-Hannah
I think the correct answer from the choices listed above is the third option. The last line of a proof represents the conclusion. In every, proof you always make final decisions and conclude it. Hope this answers the question. Have a nice day.