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Find m∠CBD if m∠ABD is 115.​

Find m∠CBD if m∠ABD is 115.​-example-1
User Peng
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1 Answer

5 votes

Answer: 65°

Explanation:

Looking at the diagram, we can see that the two angles are supplementary; so, to find the measure of the missing angle, we'll set up an equation.

Recall that the sum of two supplementary angles is 180°.

Therefore,
\bf{m\angle ABD+m\angle CBD=180}

We know that
\bf{m\angle ABD} is 115°.


\bf{115+\angle ABD=180}


\bf{\angle ABD=180-115}


\bf{\angle ABD=65}

Therefore, the measure of angle ABD is 65 degrees.

User Justin Hammenga
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