Patrick is constructing the circumscribed circle for △rst. which construction could be his first step?

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

In the diagram of circle o, what is the measure of zabc?

Use the distance formula to find the distance between (-3,5) and (3,1)