A square with sides of 4 for perimeter and area of a rectangle with length 2 width 6<span />
F = 
express the equation with F on the left side
3F - 24 = s ( add 24 to both sides )
3F = s + 24 ( divide both sides by 3 )
F = 
Here's how to do this problem:
6+ x= 55
-6 -6
x=49
First, we find x using the given equation:
x = 4 / sin(53)
x = 5
We also know that:
Cos(∅) = base / hypotenuse
Therefore,
cos(53°) = y / 5