Posted by **denise** on Monday, March 25, 2013 at 1:58pm.

A. Derive the distance formula (d) shown below for points A = (x1, y1) and B = (x2, y2).

2

2 1

2

2 1 d = (x − x ) + ( y − y )

Note: Look for an application of the Pythagorean theorem where the red line, segment

AB, is the hypotenuse of a right triangle. You can then determine the lengths of the legs

and justify why they meet at right angles.

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