In the triangle below, determine the value of c.

http://static.k12.com/eli/bb/817/-1/0/2_37302_44974/-1/b0c7bc40f7e5f494498c3168c8648c065cd7076e/media/5889cdb1feecc98fa8f9c3ab14e39097e05ddcea/mediaasset_652032_1.png

Question

In the triangle below, determine the value of c.

http://static.k12.com/eli/bb/817/-1/0/2_37302_44974/-1/b0c7bc40f7e5f494498c3168c8648c065cd7076e/media/5889cdb1feecc98fa8f9c3ab14e39097e05ddcea/mediaasset_652032_1.png

anonymous · Answer

@phi

anonymous · Answer

So for this one I believed it would fall under cosine. So I took the given info and set it up like so:
21cos(43)

anonymous · Answer

And for my answer I got 15.36

phi · Answer

cos(43)= c/21
c= 21 * cos(43) = 21 * 0.73135= 15.358

or 15.36  rounded to 2 decimal places

anonymous · Answer

Alright so I did get it correct.Good.

anonymous · Answer

Thank you again.