Answer:
I would believe you are talking about the Pythagorean Theorem:
In that case the formula is <u>L^2 + L^2 = H^2.</u>
If you have the hypotenuse it is:
<u>H^2 - L^2 = L^2:</u>
When solving, just substitute your lengths for each side of the triangle.
Note: This only works with right triangles.
The formula to find the area of a rectangle is A = wl.
A = (11)(5.5)
A = 60.5
The area of the rectangle is 60.5 inches squared.
subtract 2x from both sides... 6x=2 divide by 6 = .3
Answer:
The surface area is 
Step-by-step explanation:
see the attached figure to better understand the problem
we know that
The surface area of a triangular prism is equal to

where
B is the area of the triangular base
P is the perimeter of the triangular face
H is the height of the prism
<em>Find the area of the base B</em>

<em>Find the perimeter of the base P</em>

we have

substitute the values
The surface area is

If it is 5+2x=2x+6 than the answer is no solution