Question

find the length of c if the measure of angle A=62 degrees, the measure of angle B=39 degrees, b=15

Answer 1

find C first easy since the interior angles have to add up to 180
then use the law of sines

Answer 2

\[\frac{c}{\sin(82)}=\frac{15}{\sin(39)}\iff c=\frac{15\sin(82)}{\sin(39)} \]

Answer 3

ok so C=81

Answer 4

right so i had a typo above

Answer 5

should be \[\frac{c}{\sin(81)}=\frac{15}{\sin(39)}\iff c=\frac{15\sin(81)}{\sin(39)}\]

Answer 6

http://www.wolframalpha.com/input/?i=15sin%2881%29%2Fsin%2839%29