In 🔺️ABC, m∠A = 63° and m∠C = 99°. What is the measure of angle B?
To find the measure of angle B, we can use the fact that the sum of the angles in a triangle is always 180 degrees.
Let's say m∠B is the measure of angle B.
Therefore, we can set up the equation: m∠A + m∠B + m∠C = 180°.
Substituting the given angle measurements:
63° + m∠B + 99° = 180°.
Simplifying the equation:
162° + m∠B = 180°.
To isolate m∠B, we subtract 162° from both sides of the equation:
m∠B = 180° - 162°.
Calculating the difference:
m∠B = 18°.
Therefore, the measure of angle B is 18°.