The equation of the locus of a point equidistant from the points (a, b) and (c, d) is (a - c)  x + (b - d)  y + k = 0 What is the value of k?

What is the sum of the intercepts of the line
$\frac{x}{a^{2}}+\frac{y}{b^{2}}=\frac{2}{a^{2}+b^{2}} $ on the coordinate axes?

Which one of the following is the perpendicular form of the straight line $\sqrt{3}x+2y=7$ ?

If the vertices Band D of a square ABCD are (2, 3) and (4, 1) respectively, then what is the area of the square?