Does anyone know how to find missing angles and arcs in a circle? I need help with finding them. If you answer can you provide all the steps? The question says PBA and PCD are secants, m. The best answer will get the brainliest!

Which graph represents an even function?

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

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