Angle e will be 132 because it is a vertical angle with 132, and they are congruent. Angle d will be 48 because it must add up to 180, and 180-132=48. Angle c will be 42 because that and 138 are supplementary angles, and they need to add up to 180, so 180-138=42. Angle b will be 90 because it is across from the 90 degree angle, and so they are congruent. And angle a will be 90 as well because angles a and b are supplementary angles, so they need to add up to be 180 degrees. I hope that helps! :)
