To me i think it A but C kinda as well it tricky but me i chose a
7 = r^1/2 is the same as saying 7 = square root of r. So, to get rid of the square root sign on the r, you need to square it, and when you do something to one side of the equation, you have to do the same to the other side. So after squaring both sides, you get 49 = r.
You first have to find the length of each side.
AB=4
BC=4
CD=4
AD=4
Since this is a quadrilateral, two sides will have the same length, in this case, they all do so you can pick any two sides.
4(4)=16.
It can be solved by factoring or taking the root of both sides.
x= 2 radical 3. and -2 radical 3
