# Trig question ; )

**URL:** <https://forum.kirupa.com/t/trig-question/242939>\
**Category:** flash\
**Created:** [October 31, 2007, 8:51pm UTC](https://forum.kirupa.com/t/trig-question/242939 "2007-10-31T20:51:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Denispat](https://avatars.discourse-cdn.com/v4/letter/d/57b2e6/32.png) [@Denispat](https://forum.kirupa.com/u/Denispat)\
**Post date:** [October 31, 2007, 8:51pm UTC](https://forum.kirupa.com/t/trig-question/242939/1 "2007-10-31T20:51:30Z")

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[FONT=Arial] ![](http://www.analyzemath.com/Geometry_calculators/right_triangle_calculator.gif)Hi,[/FONT]

[FONT=Arial]I’m having a hard time figuring this one out and I’d appreciate a little help.[/FONT]  
[FONT=Arial]It’s a trigonometry Right Triangle question.[/FONT]  
[FONT=Arial]Lets say I have a starting point (x1,y1) “A” and a destination point (x2, y2) “B”. [/FONT]  
[FONT=Arial]I know the length of that side of the triangle “h” (by calculating it) and the length of a second side (witch is arbitrary) “a”. [/FONT]  
[FONT=Arial]How do I figure out (x3, y3) “C” knowing that the angle at that point will be 90 degrees?[/FONT]  
[FONT=Arial]:-/ [/FONT]

[FONT=Arial]Thanks in advance.[/FONT]