pub trait CircleExt {
// Required methods
fn radius(&self) -> f64;
fn diameter(&self) -> f64;
fn area(&self) -> f64;
fn circumference(&self) -> f64;
}pub trait CircleExt {
// Required methods
fn radius(&self) -> f64;
fn diameter(&self) -> f64;
fn area(&self) -> f64;
fn circumference(&self) -> f64;
}