Hi,

Can anybody tell me the formula for getting an angle A when I have the lengths of the 3 sides of a triangle. Ive forgotten how to do it.

Thanks for the help

Printable View

- March 31st 2005, 08:55 AMBobby BobAngle A when three lengths are known
Hi,

Can anybody tell me the formula for getting an angle A when I have the lengths of the 3 sides of a triangle. Ive forgotten how to do it.

Thanks for the help - March 31st 2005, 03:38 PMMathGuruFinding Angle A
To find an angle when you have the lengths of the three sides you can use the following formula:

a^2 = b^2 + c^2 - 2(bc)cosA

where a is the length of the side opposite A, and b and c are the lengths of the other sides.

Math Guru - April 8th 2005, 04:07 AMtheprof
See the picture

bye - April 21st 2005, 06:39 PMvms
Hi prof

How to post the images like this in the messages

thanx - April 21st 2005, 06:47 PMMathManQuote:

Originally Posted by**vms**