Q. 12

# Show that the □PQ

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.

PQ = =

QR = =

RS = =

SP = =

Slope PQ =

Slope QR =

Slope RS =

Slope SP =

As opposite sides are equal and parallel and perpendicular to each other, points form a rectangle.

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