find the surface area of a sphere in typescript

index.ts
surfaceArea = 4 * pi * radius^2
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index.ts
function sphereSurfaceArea(radius: number): number {
  const pi = 3.14159;
  const surfaceArea = 4 * pi * Math.pow(radius, 2);

  return surfaceArea;
}
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index.ts
const radius = 5;
const area = sphereSurfaceArea(radius);

console.log(`The surface area of a sphere with radius ${radius} is ${area}.`);
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index.ts
The surface area of a sphere with radius 5 is 314.159.
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