Calculate the angles of an isosceles triangle if the base angle is 77 degrees.
| March 19, 2021 | education
If the triangle is isosceles, then the angles at the base are equal, hence the second angle at the base is also 77 degrees, i.e. in a triangle there are 2 equal angles of 77 degrees.
Find the angle at the vertex. The sum of all angles must be 180 degrees.
180 – (77 + 77) = 180 – 154 = 26 – apex angle.
Answer: 77, 77, 26.
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