Answer:

Lenght of the equal sides:

Explanation:
You can observe in the picture that the triangle have two angles that have equal measure; therefore, it is an Isosceles triangle.
By definition, Isosceles triangles have two equal angles and two equal sides.
Based on this, you can write the following equation:

Solving for "x", you get this value:

Finally, you can subsitute the value of "x" into any expression to find the lenght of the equal sides:
