The outside angle BCE of triangle ABC is 67 ° and the angle ABC is 42 °. find the degree measure of the angle BAC.
| January 9, 2021 | education
Outer <BCE is adjacent to <ACB and equals 67 ° by convention. It is also known that <ABC in triangle ABC is 42 °. By definition, the degree measure of the external angle of a triangle is equal to the sum of two internal angles that are not adjacent to it. Find <BAC by applying the outer corner property:
67 – 42 = 25.
Answer: 25 °.
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