Respuesta :

a and B would be 90 degrees because the angle between B anc C is 90
The answer would be 90 degrees. angle b and the right angle are vertical angles with 124 so they have to be congruent. 124- 90 = 34 for angle b. Angle b, the right angle, and angle c have to equal 180. 180-90-34= 56 for the measure of angle a. Add 56 and 34 and you get 90 degrees!