# Angles of a triangle?

**URL:** <https://forum.kirupa.com/t/angles-of-a-triangle/2926>\
**Category:** flash\
**Created:** [March 5, 2002, 11:48am UTC](https://forum.kirupa.com/t/angles-of-a-triangle/2926 "2002-03-05T11:48:01Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/kirupa/original/3X/6/2/621e5c11736f46532526e61be85940af4230f3e5.png) [@system](https://forum.kirupa.com/u/system)\
**Post date:** [March 5, 2002, 11:48am UTC](https://forum.kirupa.com/t/angles-of-a-triangle/2926/1 "2002-03-05T11:48:01Z")

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Hello, ive been trying make a game, and i need the degree of an angle to do this. To cut to the chase, i have a right angle triangle. I know all three lengths of the sides, but how do i figure out one of the angles? I tried searching on the net but all the methods use sin-1, and in flash all it has is sin. \r\rDoes anyone have any advice on how to solve this?\rThanks-\r\r(And how do u get the flash files down the bottom of the screen?)

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/kirupa/original/3X/6/2/621e5c11736f46532526e61be85940af4230f3e5.png) [@system](https://forum.kirupa.com/u/system)\
**Post date:** [March 5, 2002, 2:12pm UTC](https://forum.kirupa.com/t/angles-of-a-triangle/2926/2 "2002-03-05T14:12:19Z")

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A right angle triangle is a triangle which has an 90° angle, right ??\r\rpom 0]

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/kirupa/original/3X/6/2/621e5c11736f46532526e61be85940af4230f3e5.png) [@system](https://forum.kirupa.com/u/system)\
**Post date:** [March 5, 2002, 3:09pm UTC](https://forum.kirupa.com/t/angles-of-a-triangle/2926/3 "2002-03-05T15:09:13Z")

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well, if it is a right triangle, you could find the other two angles if you know the length of one of the other sides. take a look in your local geometry book. or any math book.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/kirupa/original/3X/6/2/621e5c11736f46532526e61be85940af4230f3e5.png) [@system](https://forum.kirupa.com/u/system)\
**Post date:** [March 5, 2002, 5:55pm UTC](https://forum.kirupa.com/t/angles-of-a-triangle/2926/4 "2002-03-05T17:55:28Z")

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i don’t know what flash you’re talking about that only has cosine. my flash has all kinds of fun with math.\rto find out the angle between any two points:\r\rnXdiff = mcPoint2.\_x-mcPoint1.\_x;\rnYdiff = mcPoint2.\_y-mcPoint1.\_y;\rnAngle = ((Math.atan2(nYdiff, nXdiff))/Math.PI\*180)+90;\r\rthat will tell you the angle that a ray from the center of mcPoint1 would have to be in order to intersect with the center of mcPoint2.\rto use this to find out the angles of a right triangle:\rfind the angle between the two points that are NOT part of the right angle, then subtract that angle plus 90 from 180.\rAND go clockwise please.\r:) \rjeremy

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/kirupa/original/3X/6/2/621e5c11736f46532526e61be85940af4230f3e5.png) [@system](https://forum.kirupa.com/u/system)\
**Post date:** [March 5, 2002, 7:05pm UTC](https://forum.kirupa.com/t/angles-of-a-triangle/2926/5 "2002-03-05T19:05:56Z")

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the sin-1 equivelant in flash is Math.asin(). the rest is trig.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/kirupa/original/3X/6/2/621e5c11736f46532526e61be85940af4230f3e5.png) [@system](https://forum.kirupa.com/u/system)\
**Post date:** [March 5, 2002, 9:42pm UTC](https://forum.kirupa.com/t/angles-of-a-triangle/2926/6 "2002-03-05T21:42:24Z")

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If you know all the length, you can use whichever inverse function you want acos, asin or atan :

```auto
 The triangle looks like that :\r\r a\r\r ----\r\r ! /\r\rb ! / c\r\r !/

```

If A is the right angle, B is the angle on the right, and C is the lowest angle, you have

```auto
 cos(C)=b/c hence C=Math.acos(b/c) ;\r\rB=Math.acos(a/c) ;

```

. I hope this makes sense.\r\rpom 0]

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/kirupa/original/3X/6/2/621e5c11736f46532526e61be85940af4230f3e5.png) [@system](https://forum.kirupa.com/u/system)\
**Post date:** [March 7, 2002, 10:31am UTC](https://forum.kirupa.com/t/angles-of-a-triangle/2926/7 "2002-03-07T10:31:42Z")

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Thanks for the help,\r\rive tried it out and i got the right angle!