Answer: 288
Step-by-step explanation: in the triangle ABC you apply the Pythagorean theorem AC = sqrt(AB^2+BC^2) since this is a square so you have ab=ac which turn to 24= sqrt(2AB^2) <=> 24 = AB* sqrt(2)
<=> AB= 24/sqrt(2) <=> AB=12* sqrt(2) <=> the area = (12*sqrt(2))^2=288