The quadrilateral abcd has an area of 58 in2 and diagonal ac = 14.5 in. find the length of diagonal bd if ac ⊥ bd.

So the quadrilateral is a rhombus. RSM Is hard and etc...
Anyways if the area = and we know that one diagonal is 14.5 inches and we know that the area of a rhombus is 

then we can do inverse operation and do
 
4 * 2 because of the inverse operation has to be done to get the right answer and then you get the length of diagonal 2 is 8 in 

Where's the rest of the