Question

What is the value of x?

Enter your answer in the box.

x =

Answer 1

39°

Explanation:

To answer this question it's important to remember that all triangles have 3 angles which sum to 180. This means that we can set up an equation to find the missing angle

Create the equation

• 
  `39+102+x=180`

Combine like terms

• 
  `141+x=180`

Subtract 141 from both sides

• 
  `x=39`

This means that the missing angle is 39 degrees. Since two of the angles are equal to 39, this also means that this triangle is isosceles.