Plain Triangle Solver

[psychoboy1964]

Neat Little program finding angles demisions.

http://www.geocities.com/adamhelman/Triangle.html

[MicroZone]

Neat...may come in handy, quick and easy.

[MNSTRBLDR]

For right triangles, just take side opposite squared + side adjacent squared. The square root of that is the hypotenuese side.

[jas746]

A squared plus B squared = C squared
side A = 3
side B =4
side C = ?
3 sq + 4 sq = ?
9 + 16 = 25
square root of 25 is 5
side C = 5
works for any unknown side.
must know two sides and have a 90 degree angle in triangle !

[Tailshaft56]

A squared plus B squared = C squared
side A = 3
side B =4
side C = ?
3 sq + 4 sq = ?
9 + 16 = 25
square root of 25 is 5
side C = 5
works for any unknown side.
must know two sides and have a 90 degree angle in triangle !

This is the old 3,4,5 method of checking square. Measure and mark 3 units on one side, 4 on the next side, Measure between marks wil be 5 units if the sides are square. Units can be anything you want. Inches, feet, meters, or yards.

[jas746]

if hyp is known.........
C squared - B squared = A squared
square root of = A

[Engloid]

A squared plus B squared = C squared
works for any unknown side.
must know two sides and have a 90 degree angle in triangle !

Actually, you don't have to have a 90 degree angle for this to work. It works for ANY triangle.

[Tailshaft56]

A squared plus B squared = C squared
works for any unknown side.
must know two sides and have a 90 degree angle in triangle !

Actually, you don't have to have a 90 degree angle for this to work. It works for ANY triangle.


I don't think so. That formula is the Pythagorion theroem and only applies to right triangle. I'll check my math book to be sure. I do no the total number of degrees of any triangle adds up to 180.

[Engloid]

it's been a long time since I had to take any math classes, so you may be right.

[Tailshaft56]

I just checked and it only works for a right triangle, However you can solve an oblique triangle with the thereom by first dividing the triangle in half to form 2 right triangles.

[Brad Blazer]

For triangles that are not 90 degrees, the Law of Cosines works if you have 2 sides a & b and the included angle C.
c^2 = a^2 + b^2 - 2*a*b*cos(C)
Here is a solver and better explanation:
http://hyperphysics.phy-astr.gsu.edu/Hbase/lcos.html

[Capo3rd]

also working on the 3,4,5 rule. they can be made larger by using a common multiplier, ie ... 6 ...... 3(6)=18, 4(6)=24, 5(6)= 30 ... this can be done with any number as a multiplier to get a right angle

[pilebuck]

I carry a little dewalt construction cheat book in my tool bucket, you can pick them up at a decent bookstore for about $12. Full of formulas, codes, rigging, weights of common construction material etc. Good quick reference when you want to doublecheck something, or just good bathroom reading!

[Kermit]

Forty years ago in high school, my math teacher taught me a simple saying that helps me remember right angle formulas.
"Saddle our horses, Canter away happily, Toward other adventures"
Sine=opposite over hypotenuse, Cosine=adjacent over hypotenuse, Tangent=opposite over adjacent.

[neex]

SOH
CAH
TOA

That was a 'saying' we used that was more of a chant than anything but it sure as hell stuck like glue... I like the adventurous cantering horses much more though...

Thanks,
Andrew.