How many square feet of outdoor carpet will we need for this hole? HELP PLS!!!

Quick! what is the area of this trapezoid?

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

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