Prove the distance formula.

1.	Prove the distance formula.
Answer» (Take a triangle on graph name it as PQR)In triangle PQRPQ^2 = PR^2 + QR^2PQ^2 = (x2 - x1)^2 + ( y2 - y1 )^2PQ = √(x2 - x1)^2 + (y2 - y1)^2

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