I don’t understand this question

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

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

The area of a circle is equal to 1 dm². find the radius of the circle.