find the surface area of a regular polygon inscribed in a cylinder in typescript

index.ts
function surfaceAreaOfRegularPolygonInCylinder(numSides: number, sideLength: number, cylinderHeight: number): number {
  const perimeter = numSides * sideLength; // Step 1
  const radius = perimeter / (2 * Math.PI); // Step 2
  const lateralArea = 2 * Math.PI * radius * cylinderHeight; // Step 3
  const baseArea = Math.PI * radius ** 2; 
  const totalSurfaceArea = lateralArea + 2 * baseArea; // Step 4
  return totalSurfaceArea;
}
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index.ts
const numSides = 6;
const sideLength = 2;
const cylinderHeight = 5;
const surfaceArea = surfaceAreaOfRegularPolygonInCylinder(numSides, sideLength, cylinderHeight);
console.log(`Surface area of regular hexagon inscribed in cylinder: ${surfaceArea}`); // Output: Surface area of regular hexagon inscribed in cylinder: 65.34431147073193
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