x(unknown degree) + 38(given degree) + 90(right triangle's angle) = 180(sum of all angles of a triangle will equal 180)
x + 38 + 90 = 180
128 + x = 180
-128 -128
X = 52 degrees
whenever given a triangle ALL their angles will have a sum of 180 degrees, a quadrilateral will have a sum of 360 degrees. Whenever given a right triangle remember to add the right angle's degree when solving for x and make sure to double check. When given 3 angles of a 4 sided shape (quadrilateral) make sure to add those 3 given degrees and add the missing value (x as your variable) to equal the sum of 360 degrees. also its the same with different given degrees, if you are given 2 angles or 1 angles measure you know that 3 or 2 of the unknown values will be replaced as x.
