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.

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**MathMate**, Thursday, October 28, 2010 at 6:23pm
Find out the lengths of each side using the distance formula:

D=√((x2-x1)²+(y2-y1)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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