JS Bin

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/*

Create a function named surfaceAreaOfSphere that calculates the surface area of the Sphere using the following formula: 4 * PI * r**2; the function MUST reuse the areaOfCircle function below

*/

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// areaOfCirle function; do not modify

function areaOfCircle(radius){

  return Math.PI * (radius**2)

}

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function surfaceAreaOfSphere(radius){

  // Add your code here

}

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const sphereSurfaceArea = surfaceAreaOfSphere(10)

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console.log(`surface area of a sphere ${sphereSurfaceArea}`)

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