Using the Isosceles triangle theorem to find the measure of x

The video tutorial explains the isosceles triangle theorem, which states that if two sides of a triangle are congruent, then the opposite angles are also congruent. The teacher demonstrates this by identifying congruent angles in a given triangle and solving for the variable x. The process involves setting up an equation based on the sum of angles in a triangle and solving for x. Finally, the teacher calculates the measure of the angles using the value of x.

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