tan 45° = 1.
http://wiki.answers.com/Q/What_is_the_tangent_of_4...

The tangent of 45 degrees or pi/4 is 1.
http://www.chacha.com/question/whatitthetangent...

A forty five degree angle is one half of a right angle. And it is one equal angles of an isosceles right triangle. It is also a construction measurement for cornices.
http://answers.ask.com/Reference/Other/what_is_a_4...

......./.... ...b./..... ..../.....a. .../___... .....c..... ........... Tangent of x means the value of a/b in a triangle with the angle x between b and c. In a right angled
http://answers.yahoo.com/question/index?qid=100512...
