To get the most from a direct box, your mixing board must have balanced mic and/or line inputs! (Note that some mixers offer both XLR and 1/4 balanced inputs -- check your manual.) Use a direct box if you are experiencing hum, buzz, or radio interference, or if your instrument's cable is longer than 20 feet.
When a transversal (any line that passes through two parallel lines) cuts two parallel lines then the angles that correspond to the similar positions (angles in the matching corners) with respect to either of the parallel lines and lie on the same side of the transversal are called the Corresponding angles.
Adjacent angles: Two coplanar angles with a common side, a common vertex, and no common interior points. example below shows angles ADB and BDC are complementary angles. that they share a common vertex D and have no common interior points. Complementary angles: Two angles whose measures have a sum of 90. The diagram below shows two angles when combined add up to 90 degrees. Although not pictured, complementary angles do not have to be adjacent.