What size cap would someone with a head circumference of 570 mm need?

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

Yo need asap pls ! markin da brainiest too !