Calculate Angle X in an Equilateral Triangle: Interior Angle Problem

Question

Calculate the size of angle X given that the triangle is equilateral.

00:00 Determine the value of X

00:03 In an equilateral triangle all angles are equal

00:06 The sum of angles in a triangle equals 180

00:09 Therefore the angle multiplied by 3 should equal 180

00:12 Isolate X

00:15 This is the solution

Remember that the sum of angles in a triangle is equal to 180.

In an equilateral triangle, all sides and all angles are equal to each other.

Therefore, we will calculate as follows:

$x+x+x=180$

$3x=180$

We divide both sides by 3:

$x=60$