find the surface area of a sphere in rust

To find the surface area of a sphere in Rust, use the formula 4 * π * r^2, where π is pi (approximately 3.14159) and r is the radius of the sphere.

Here's an example code implementation of the formula:

main.rs
fn surface_area_of_sphere(radius: f64) -> f64 {
    let pi = std::f64::consts::PI;
    4.0 * pi * radius.powi(2)
}
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In this example, the function surface_area_of_sphere takes in the radius of the sphere as a parameter and calculates and returns the surface area of the sphere using the formula.

You can then call this function with a desired radius value to get the surface area of the corresponding sphere, like so:

main.rs
fn main() {
    let radius = 2.5; // or any desired radius value
    let surface_area = surface_area_of_sphere(radius);
    println!("Surface area of sphere with radius {} = {}", radius, surface_area);
}
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This will calculate and output the surface area of the sphere with the given radius value.