In triangle ABC, the angle at the vertex A is 55 degrees, AB = BC. find the angle at vertex B.
| September 1, 2021 | education
If in a triangle the two sides are equal, then this triangle is isosceles. In an isosceles triangle, the angles at the base are also equal:
∠А = ∠С = 55º.
Since the sum of all the angles of the triangle is 180º, the degree measure of the angle ∠В is equal to:
∠В = 180º – 55º – 55º = 70º.
Answer: the degree measure of the angle ∠B is equal to 70º.
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.
