In triangle ABC, the angle A is 14 °, the outside angle at the vertex B is 91 °. Find the corner C.

It is known that the outer angle of a triangle is equal to the sum of two angles that are not adjacent to it.
Using this property, we have:
∠В = ∠ВАС + ∠АСВ;
∠АСВ = ∠В – ∠ВАС = 91 ° – 14 ° = 77 °.
Answer: The angle C of this triangle is 77 °.



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.