To find the measure of angle B in triangle ABC, you can use the fact that the sum of the angles in a triangle is always 180°.
m∠A + m∠B + m∠C = 180°
Substituting the given values:
63° + m∠B + 99° = 180°
Simplifying the equation:
162° + m∠B = 180°
Subtracting 162° from both sides:
m∠B = 180° - 162°
m∠B = 18°
Therefore, the measure of angle B is 18°.
In △ABC , m∠A=63° and m∠C=99°. What is the measure of angle B?(1 point) m∠B = °
1 answer