1. Loosen the screws so the piece can be inserted. This will either be one or two handles to loosen depending on the design of the clamp. 2. Insert the right angle into the clamp
http://www.ehow.com/how_10002844_clamprightangle...

1. Know the 6 trig ratios. You need to memorize the following: sine. abbreviated as sin. opposite/hypotenuse. cosine. abbreviated as cos. adjacent/hypotenuse. tangent. abbreviated
http://www.wikihow.com/UseRightAngledTrigonomet...

It is a square.
http://wiki.answers.com/Q/What_is_a_rhombus_with_r...

there are no right angles in a trapezoid or a trapezium.
http://wiki.answers.com/Q/Where+is+a+right+angle+o...
