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## #1 2014-02-03 14:00:39

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 20,255
Website

### Area of triangles without right triangles

http://www.mathsisfun.com/algebra/trig- … angle.html

Wonderful page, indeed!

BTW, Please include this formula too:

Last edited by Agnishom (2014-02-03 14:07:53)

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'You have made another human being happy. There is no greater accomplishment.' -bobbym

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## #2 2014-02-05 11:45:40

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,560

### Re: Area of triangles without right triangles

Isn't sin(A)/2 easier than sin(A/2)cos(A/2) ?

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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## #3 2014-02-05 13:37:34

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 20,255
Website

### Re: Area of triangles without right triangles

It is but then high school children do not always know the T-ratios of obtuse angles.

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'You have made another human being happy. There is no greater accomplishment.' -bobbym

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