Saturday

April 19, 2014

April 19, 2014

Posted by **gt** on Wednesday, April 24, 2013 at 11:57pm.

cos 60¡ã ¡Ö 0.5, and tan 60¡ã ¡Ö 1.73. Approximately how many units long is BC , to the nearest

hundredth of a unit?

A. 4.00

- trignometry -
**Reiny**, Thursday, April 25, 2013 at 8:35amSince you posted this twice, I think you realized that the symbols did not come out like you intended.

I think you meant this:

AB = 8, angle A = 60°

then you are given

sin60° = .866

cos60° = .5

tan60° = 1.73

the problem is that we don't know where the 90° angle is, could be at C or at B

If angle B = 90°

then

BC/8 = tan60

BC = 8tan60 = 8(1.732) = appr 13.86

if angle C = 90°

then

BC/8 = sin60

BC = 8sin60 = 8(.866) = appr 6.93

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