In triangle ABC, the measure of angle A is Angle 70°. B is congruent to angle C. What is the measure of angle B in degrees?

Answer 1

Since angle B is congruent to angle C, let's denote their shared angle measurement as x.

So, we know that Angle A measures 70 degrees, and the sum of the angles in a triangle equals 180 degrees. Therefore:

Angle A + Angle B + Angle C = 180

Substituting the values we know:

70 + x + x = 180

Combining like terms:

70 + 2x = 180

Subtracting 70 from both sides:

2x = 110

Dividing by 2:

x = 55

Therefore, the measure of angle B (which is congruent to angle C) is also 55 degrees.