Show that the points A (5, 6), B (1, 5), C (2, 1) and D (6, 2) are the vertices of a square ABCD.

The distance of point (-8, 6) from x-axis is:

1. 8

2. 6

3. 10

4. none of these

The co-ordinates of point P are:

1. (0, 5)

2. (5, 0)

3. (4, 3)

4. (3, 4)

AB (= 10 unit) is diameter of a circle with center at point P = (x, 0) and point B = (0, y). The relation between x and y is:

1. x + y = 10

2. x + y = 25

3. x² + y² = 5

4. x² + y² = 25