Answer:
8.06 inches
Step-by-step explanation:
The diagram shows a rectangle with width of 4 inches and area of 28 square inches.
Use area formula:

So,

By the Pythagorean theorem,

If you add them all you get 50x12y13
(x + 5/2 * 2/5)^2 = -5/2
(x)^2 sqrt 2 = -5/2 sqrt 2
(x) = i sqrt10/2 - 5/2, i sqrt10/2 - 5/2
Angle A and Angle D are congruent because angles of an equilateral triangle are congruent.
Side AD is equal to side AD because of the reflexive property
Side AC is congruent to side DB because components of sides are congruent
Therefore, Triangle ACD is congruent to Triangle DBA