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As @jjennings239 wrote, exponentiation operator(**) is not supported in all environments. You can try to use Math.pow(a,b) function. In your case it would be:
console.log(PI*Math.pow(r,2));
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Day 1: Let and Const
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As @jjennings239 wrote, exponentiation operator(**) is not supported in all environments. You can try to use Math.pow(a,b) function. In your case it would be: