hi i have this:

circle (x+4)^2 + (y+4)^2 = 20crosses the x-axis at the points A and B and y-axis at points C and D. Find the area of the quadrilateral ABCD.

I spend so much time trying to figure height etc. but all i could get was sides lenghts, so the only way i could get to the solution was by using this quadrilateral formula

x1 * y2 - y1 * x2 .... but as am doing this from textbook that way is never mentioned anywhere , so can someone please tell what would be the other way of doing it ?