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psychoboy1964
07-09-2006, 05:14 PM
Neat Little program finding angles demisions.

MicroZone
07-09-2006, 10:02 PM
Neat...may come in handy, quick and easy.

MNSTRBLDR
07-11-2006, 01:54 PM
For right triangles, just take side opposite squared + side adjacent squared. The square root of that is the hypotenuese side.

jas746
08-27-2006, 03:43 PM
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
08-29-2006, 11:03 AM
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
08-31-2006, 01:39 AM
if hyp is known.........
C squared - B squared = A squared
square root of = A

Engloid
09-03-2006, 12:26 PM
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
09-03-2006, 09:58 PM
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
09-03-2006, 10:15 PM
it's been a long time since I had to take any math classes, so you may be right.

Tailshaft56
09-03-2006, 11:01 PM
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.

11-29-2006, 10:53 PM
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
01-01-2007, 11:09 AM
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
10-07-2007, 04:17 PM
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
10-08-2007, 07:07 PM
Forty years ago in high school, my math teacher taught me a simple saying that helps me remember right angle formulas.