Law of sin and law of cosine

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Law of sin and law of cosine

Postby barnamah » Mon 11 April, 2011 20:23

Law of Sin

If we have triangle with each angle called A, B and C and the line between them are called a, b and c view image Image
then
`sinA/a=sinB/b=sinC/c` this can be applied into a triangle
so if we have lets say angle B, side b and angle A then can use `sinA/a=sinB/b` to find a.


Cosine Law
By looking at the image:
Image

`a^2=b^2+c^2+(2bc)cosA`
`b^2=a^2+c^2+2(ac)cosB`
`c^2=a^2+b^2+(2ab)cosC`
Explore and know. That is asked.
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