A square sheet of paper has area 6 cm^2. The front is white and the back is black. When the sheet is folded so that point A rests on the diagonal as shown, the visible black area is equal to the visible white area. What is the visible black area, in cm^2?
Visible black area = 2 cm2
It would just be that 2(black area) + white area = 6 cm^2, so 3 * white area = 6 cm^2 so white = black = 2 cm^2