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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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do you know law of cosine?
no i dont :{

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Other answers:

wait what
i'm trying to use the equation editor but failing...
the cosine rule when applied here is 2^2 = 3^2 + 4^2 - 2.3.4 cos theta
so you now need to solve for 2.3.4 cos theta
how
well use the rules of algebra
subtract 3^2 + 4^2 from both sides then multiply through by -1
-24 ?
2^2 - 3^2 - 4^2 = 3^2 + 4^2 - 3^2 - 4^2 - 2.3.4 cos theta so the 3^2 and 4^2 disappear from the right side
can you continue? No its not -24
oh wait is it 21
yea
-21 = - 2.3.4 cos theta multiply both sides by -1 21 = 2.3.4 cos theta
k thanx
yw
the cosine rule is used if you know 2sides of a triangle and included angle or 3 sides and you require on of the angles. It can be applied to all triangles.
|dw:1435914229839:dw|
c^2 = a^2 + b^2 - 2ab cos C
oh i see thnx..again
no probs

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