Find the volume of a cylinder with lateral area 112 pi and radius 7. Please help ASAP the photo shown is the formula !

How to do this , and can some one explain

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?