According to the properties of exterior angles of triangles, the measure of an exterior angle of a triangle is equal to the sum of the measures of its two remote interior angles.
Given that angle a is 142, we can consider it as an exterior angle of triangle ABC. To find angle b, we can subtract the measure of angle a from 180 degrees (since the sum of angles in a triangle is 180 degrees), and then subtract the result from angle c (which we don't know) to find angle b.
180 - 142 = 38
So, angle b is 38 degrees. Therefore, the answer is 38.
Use the properties of exterior angles of triangles to find angle b.
Angel a is 142
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38
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