Answer:
92
Explanation:
I don't know what the question is asking for so I'm just going to presume it asked to solve for 3.
The basic rule for triangles is that no matter what their shape is the sum of their angles will always be 180 degrees.
In order to get angle 3, you'll need to know the value of 4. Since the sum of angles 3 and 4 is 180 degrees, (We can know this because the line that has angle 3 and 4 marked, is a straight line)all we have to do in order to get the value of angle 3 is to subtract angle 4's value from 180.
So we solve for angle 4 first.
180-(45+47)= 180-(92)
=88
Angle 4 is 88 degrees now for angle 3.
180-88=92
Angle 3 is 92 degrees.