On Thu, 16 Sep 1999 10:25:09 -0800, David Heys wrote:
>Anyone else who wants to pipe in, or add in other nifty time saving
>formula's (like I believe the circumference of a circle is supposed to be
>equal to pi*(r^2)), please do. :{)

There's the Cosine Theorem:

c=sqrt(a^2+b^2-2ab*cos(C))

for sides a and b and the angle between them C.  If C is 90 degrees, its 
cosine is zero and the formula simplifies to the Pythagorean Theorem.

Post a reply to this message