Assignment for Monday, 1/28

A. Turn in the previous assignment if you have not yet done so.

B. Think about angles between planes in a practical way (angles on a roof, angle between a door and a wall, etc.) and then give a clear definition/method for measure the angle between two planes.  Make a tool that with a regular protractor will measure the angle between two planes.

C. Make a nice cardboard model (nice = careful enough, flat enough, and big enough to measure somewhat accurately) of a regular tetrahedron.  Measure the angles between planes and tell your result.  Then use geometry to give an exact answer (it may involve trig to give a numerical answer, but you can state the answer as an inverse tan or inverse sin or something.