Given the angle of the vertex ∡ N of an isosceles triangle RNC. Determine the values of the angles adjacent to 2.

Given the angle of the vertex ∡ N of an isosceles triangle RNC. Determine the values of the angles adjacent to 2. The value of one of the angles adjacent to the base of an isosceles triangle is 77 °. Determine the value of the angle of the apex of this triangle. base.

Let x be the angle above the base of this p / b triangle. If we are given one of the angles at the base, then the second angle at the base will also be = 77 degrees. Let’s compose and solve the equation, knowing that the sum of the angles of any triangle = 180 degrees.
77 + 77 + x = 180
154 + x = 180
x = 180-154
x = 26
Answer: the angle over the base of the p / w triangle = 26 degrees.