Math/Angle help?

[Oceanseve]

Okay I know I'm over thinking this, but humor me please?

We are doing a slanted roof, so how do I figure the other two angles for my right triangle? 4' 6" wide and 18" tall.

 

[new-roo]

Quote:
A right triangle has a 90 degree angle and 2 45 degree angles.

 

[Oceanseve]

Its been a while since my last geo class, but I thought that was only if the two legs were equal.....

 

[redoak]

I sometimes cheat and use this site ........ http://www.csgnetwork.com/righttricalc.html

 

[new-roo]

Quote:
Right angle - Wikipedia, the free encyclopediaFeb 10, 2009 ... In geometry and trigonometry, a right angle is an angle of 90 degrees, corresponding to a quarter turn

If you have a right triangle then the legs must be the same

 

[domino7]

Quote:
Right angle - Wikipedia, the free encyclopediaFeb 10, 2009 ... In geometry and trigonometry, a right angle is an angle of 90 degrees, corresponding to a quarter turn

If you have a right angle then the legs must be the same

NOT TRUE

 

[Oceanseve]

I don't trust anything off wiki

redoak - THANK YOU!!

 

[new-roo]

Quote:
Right angle - Wikipedia, the free encyclopediaFeb 10, 2009 ... In geometry and trigonometry, a right angle is an angle of 90 degrees, corresponding to a quarter turn

If you have a right angle then the legs must be the same

NOT TRUE

Too quick, I edited a right triagle has equal lengths in post above.

 

[Oceanseve]

Redoak - thanks again. I have to admit it makes me proud, the math I did before you posted that is almost dead on

I still got it

 

[russ_t]

rise/run = tan(x)
so
18/54 = tan(x)
x = atan(0.333) = 18.43