Use the properties of exterior angles of triangles to find angle b .
bottom right is 90 degress
bottom left is b
top is a and 142
(1 point)
Since the sum of the three exterior angles of a triangle is 360 degrees, we can find angle b by subtracting the other two angles from 360.
360 - 90 - 142 = 128
Therefore, angle b is 128 degrees.