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January 30, 2015

January 30, 2015

Posted by **Parker** on Saturday, October 1, 2011 at 10:02pm.

- trig -
**Reiny**, Saturday, October 1, 2011 at 10:33pmA trivial question

Just plot the points and you will see that angle Y = 90°

(XY is a horizontal line, and YZ is a vertical line)

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