the length of a straight line passing through the center of a circle and connecting two points on the circumference
3
attempt
earnest and conscientious activity intended to do or accomplish something: "made an effort to cover all the reading material"; "wished him luck in his endeavor"; "she gave it a good try"
1
effort
use of physical or mental energy; hard work; "he got an A for effort"; "they managed only with great exertion"
