Please explain to me the value of angle alpha. Last time I studied Trig the tangent of alpha was sine/cosine which in the illustration would be b/a. What did I miss? Please advise.

Old trig student from long ago

## Re: Hyperbolic Defined

Please explain to me the value of angle alpha. Last time I studied Trig the tangent of alpha was sine/cosine which in the illustration would be b/a. What did I miss? Please advise.

Old trig student from long ago