A scalene Triangle With a Side A 12m Long Side B 5m long and one angle which is opposite length A at 2.1 rad

help with knowing the rest of the angles in degrees and also the other side please

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- Feb 5th 2013, 10:35 AMscholezy93using sine and cosine
A scalene Triangle With a Side A 12m Long Side B 5m long and one angle which is opposite length A at 2.1 rad

help with knowing the rest of the angles in degrees and also the other side please - Feb 5th 2013, 04:05 PMProve ItRe: using sine and cosine
Use the sine rule to find angle B.

Use the fact that the angles add to 180 degrees to find angle C.

Use the sine rule to find side c. - Feb 5th 2013, 04:49 PMHallsofIvyRe: using sine and cosine
Or you could use the cosine law: $\displaystyle a^2= b^2+ c^2- 2bc cos(A)$ with a= 12, b= 5, and A= 2.1 to get a quadratic equation to solve for c. Note that there may be two different values for c and so two different triangles.