Round to the nearest integer 31.4829

Find the area of the regular hexagon if a side is 20 cm.

Acircle has a circumference of 28.36 units what is the diameter of the circle

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