An engineer is designing three triangular traffic signs with a computer program. The vertices of sign A are located at (2,2),(2,12), and (17,7). The vertices of Sign B are located at (4,4),(11,19),and (18,4). The vertices of sign C are located at (4,8),(24,1), and (24,15). Put the signs in order from largest to smallest perimeter.

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters