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Law of Sin by HP
08-03-2018, 06:08 PM
Post: #3
RE: Law of Sin by HP
(08-03-2018 05:59 PM)Albert Chan Wrote:  I just peek at your link, A, B, C are sides, X, Y, Z angles.

A^2 + B^2 = C^2 - 2 A B cos(Z)

I'd say A² + B² = C² + 2AB cos(Z)
Or C² = A² + B² – 2AB cos(Z)

(08-03-2018 05:59 PM)Albert Chan Wrote:  So, for right angle Z, A^2 + B^2 = C^2, as expected

That's also true for the correct formula. ;-)

Regarding the screenshot on the linked site:

The formulas refer both to the law of cosines (the three equations at the top) and the law of sines (smaller, right of the triangle), but here sides and angles have been swapped. It should read sin(X)/A = sin(Y)/B = sin(Z)/C.

So this looks like an error.

Dieter
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Messages In This Thread
Law of Sin by HP - acoto - 08-03-2018, 05:46 PM
RE: Law of Sin by HP - Albert Chan - 08-03-2018, 05:59 PM
RE: Law of Sin by HP - Dieter - 08-03-2018 06:08 PM
RE: Law of Sin by HP - Albert Chan - 08-03-2018, 08:32 PM
RE: Law of Sin by HP - Albert Chan - 08-03-2018, 06:22 PM
RE: Law of Sin by HP - acoto - 08-03-2018, 07:40 PM
RE: Law of Sin by HP - acoto - 08-03-2018, 08:36 PM



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