Answer:
x = 13
Explanation:
The tiny marks on all three sides means this shape is an equilateral triangle (all three sides are the same) This means that all three angles are also the same. 180° degrees in a triangle, so all three angles are 60°.
Use this info to set up an equation.
4x + 8 = 60°
Subtract 8.
4x = 5 2
Divide by 4.
x = 13