Calculate Angle X in an Equilateral Triangle: Interior Angle Problem

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

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Step-by-step video solution

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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

Step-by-step written solution

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1

Understand the problem

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

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2

Step-by-step 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 x+x+x=180

3x=180 3x=180

We divide both sides by 3:

x=60 x=60

3

Final Answer

60

Practice Quiz

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In a right triangle, the side opposite the right angle is called....?

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