Find the circumference of the circle and round to the nearest tenth

Can someone me out here and the tell me the greatest common factor

Plzzz answer both questions and i will give you 100 points

Plz hurry finals a paper cup in the shape of an inverted cone is 8 inches tall and has a radius of 1.5 inches. how much water can the cup hold? use 3.14 for pi. round the answer to the nearest tenth. a) 12.6 cubic in. b) 18.8 cubic in. c) 37.7 cubic in. d) 56.5 cubic in.