1.) in triangle abc, the measure of a is 70°. angle b is congruent to angle c. what is the measure of angle b in degrees.

In a triangle, the three interior angles always add to 180°

m∠B = (180-70)/2 = 55°

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!