Question 356818: An isosceles trapezoid had an angle measuring 138°. What are the measure of all the other angles Found 2 solutions by Fombitz, Edwin McCravy:Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website! Since it's isoceles,
Two angles are 42 degrees, two angles are 138 degrees.
Since the trapezoid is isosceles, the angle on the upper right
is also 138°.
The lower left angle is supplementary to 138°, so it is 180°-138°
or 42°.
Since the trapezoid is isosceles, the angle on the lower right
is also 42°.
Edwin