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