How to find the value of x in a triangle?

An unknown angle in a triangle is found using the angle properties of a triangle.

Answer: The value of x in a triangle is 120°

Let us understand the concept through an example.

Explanation

The given triangle is an equilateral triangle. 

Hence, all angles are equal to 60°.

Now, for a triangle we know that

Interior angle + adjacent exterior angle = 180°

60° + x = 180°

x = 180° –  60° = 120°.

Hence, The value of x in a triangle is 120°