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June 26, 2016
Posted by **John** on Thursday, October 4, 2012 at 11:08am.

5√3 secθ = 10 in degree measure?

please explain.

- Trigonometry -
**Reiny**, Thursday, October 4, 2012 at 11:20amsecØ = 10/5√3 = 2/√3

then

cosØ = √3/2

You should be familiar with the 1 : √3 : 2 right-angled triangle which has angles of 30:60:90

thus Ø = 30°

but the cosine is also positive in the fourth quadrant

so Ø could be 330°

Ø = 30° or Ø = 330°