1. The formula for are of a circle is A=πr². So sub in what you know: 144=πr². Since the pi is in the question just take that out and find the square root of 144: √144=12. Diameter is twice the radius: 12•2=24 so the diameter is 24 feet :) 2. A would be to specific and just his class, b would be just in her class, d is just honors students, but C would be random cause you never know who's going to enter the caf, so I would say C :)
