Answer:
x =
(or
if it needs to be represented as a rational denominator)
Explanation:
We know that;
1.) This triangle is equilateral, and because of the line segment it's divided into 2 right triangles.
2.) The base of the whole triangle would be 4, and the base of the right triangle would be 2, since the base is cut in half with a mid point.
Therefore we can say;
A² + B² = C²
x² + 2² = 4²
x² + 4 = 16
x² = 16 - 4
x² = 8
x =

Simplifying this further would be;
=
=
(or
if it needs to be represented as a rational denominator)
Hope this helps!