The triangle abc has an external angle at the vertex a 130, the internal angle at the vertex c 60
| March 11, 2021 | education
The triangle abc has an external angle at the vertex a 130, the internal angle at the vertex c 60, find the external angle at the vertex B of the triangle.
1. The inside angle at vertex A is 180˚ – 130˚ = 50˚.
2. The degree measure of the internal angle at the vertex B is equal to 180˚ – (50˚ + 60˚) = 180˚ – 110˚ = 70˚.
3. The outer angle at the vertex B of the triangle ABC is 180˚ – 70˚ = 110˚.
Answer: the outer angle at the vertex B of the triangle ABC is 110˚.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.
