Posted by Ted on Thursday, October 28, 2010 at 5:36pm.
show that triangle PQR with P(2,10, Q(1,5) and R(5,2) is isosceles.

math  MathMate, Thursday, October 28, 2010 at 6:23pm
Find out the lengths of each side using the distance formula:
D=√((x2x1)²+(y2y1)²)
If two sides are identical in length, the triangle is isosceles.
If all three have the same length, then it is equilateral.
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