Ok, have been scratching my head a bit on this one...


It should be simple enough as it is a right angle triangle that I am working on..

(Actually it's for stair cases)

What I need to be able to find is the Hypotenuse..

Simple enough ? I thought so as well...

hyp = Opposite / Sin(34)

which if am understanding things right, the php should look like..

$hyp = $oppo / sin(35);

ok, so then I realised I was getting degrees not radians..

so used.. deg2rad()

$hyp = $oppo / deg2rad(sin(35));

and guess what, the answer I get does not match what I expect to see, I have used my daughters GCSE revision books to check the results, using :-

$hyp = 15 / deg2rad(sin(35));

$hyp should = 26.151 (or there abouts)

However I get -2007.17299864 !!!! not quite what was expecting..

HELP please..

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Thanks... Simon

I hate trig unless its for calculus. When working in radians, 15/sin(35) is -35.0317748. When working in degrees it is 26.15170193. Have you ran though the math with a calculator before writing the program?

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PHP's sin($x) expects the value to be in radians. So, you should always send it in radians.

You can convert any angle in degrees to radians with this simple formula.

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My Site

Worked perfect thanks for the help :D

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Thanks... Simon