Q. 15

# Show that A(4, -1

According to the distance formula, the distance 'd' between two points (a,b) and (c,d) is given by
.....(1)

Slope of a line between two points (a,b) and (c,d) is

Note: If the Product of slopes of two lines = -1 then they are perpendicular to each other.

AB = =

BC = =

CD = =

Slope AB =

Slope BC =

Slope CD =

As all sides are equal and ajdacent sides are perndicular. Given points form a square.

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