Posted by **y912f** on Monday, November 24, 2008 at 2:30pm.

can you please tell me if the points (8,9) (15,2) and (17,4) are the vertices of a right triangle

- trig -
**drwls**, Monday, November 24, 2008 at 3:23pm
The lengths L of three sides are sqrt 98, sqrt 8 and sqrt 106. You can prove that using

L = sqrt[(y2-y1)^2 + (x2-x1)^2]

The pythagorean relationship a^2 + b^2 + c^2 is therefore obeyed, since 98 + 9 = 106.

What does that tell you about the triangle?

You could prove it in other ways, but this appeared to be the simplest.

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