+24 For some points of the form (k,7), the points A(2,3), B(12,13)and (k,7)
form a right-angled triangle. Suppose that C is such a point so that △ABC
is right-angled at C. Suppose that D is also such a point so that △ABD
is right-angled at D( D≠C). What is the area of ACBD?
