Help pls! :/ I can't solve this

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.

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