I don't really get graphs

Match the term on the left with its image or description on the right. match term definition diameter a) circle a and a line segment connecting points b and c which are on the circle. circumference b) circle a and a line segment connecting points b and c which are on the circle. radius c) a piece of the circumference of a circle secant d) two circles that share the same center. concentric circles e) the distance around a circle arc f) a segment between two points on a circle that passes through its center

1. what is the measure of ∠abc? what is the measure of ∠abd?

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?