If (a,0) and (0,b) are two opposite vertices of a diagonal of a square, then one of the remaining two vertices is :
The are of △ABC with vertices A(a, 0), O(0, 0) and B(0, b) in square units is
(a) ab (b) 12ab (c) 12a2b2 (d) 12b2
The points B (1, 3) and D (6, 8) are two opposite vertices of a square ABCD. Find the equation of the diagonal AC.