Respuesta :

Answer:

angles A+ 100 + B are supplementry and add up to 180 degress.  Angle A and 20 degree angle are congruent, so angle A is 20 degrees.  Angle B and 60 degrees are congruent so B is 60 degrees.  Angle C and 100 degrees are congruent so C is 100 degrees.

Step-by-step explanation: