Use facts about supplementary angles to solve the following problem. Two angles are supplementary and have measures m∠ABC=15° and m∠CBD=x°. What is the value of m∠CBD ?
The sum of the measures of two supplementary angles is 180°.
We are given that m∠ABC = 15° and we need to find m∠CBD.
Therefore, we can set up the equation 15° + x° = 180°.
By subtracting 15° from both sides of the equation, we get x° = 180° - 15° = 165°.
So, the value of m∠CBD is 165°.