Find the angles of the triangle ABC if AB = BC and they are proportional to 2: 5: 2.

The solution of the problem:
In the condition of this problem, a triangle abc is given. In this triangle, the side ab is equal to the side of the sun, which means that the triangle is isosceles. Equal angles lie at the base of an isosceles triangle. The sum of all three angles of a triangle is one hundred and eighty degrees.
1. Find the sum of all proportional numbers of the angles of the triangle.
2 + 5 + 2 = 9.
2. Let’s find how many degrees fall on one part.
180/9 = 20 degrees.
3. Find out what the angles of the triangle are equal to.
a = 2 * 20 = 40 degrees. h = 5 * 20 = 100 degrees. c = 2 * 20 = 40 degrees.