Question

How to calculate the area of a pentagon in JavaScript

Answer 1

function pentagon_area(side, apothem) {
    return 5.0 * (side * apothem) / 2.0;
}

const side = 5.0;
const apothem = 3.0;

const area = pentagon_area(side, apothem);

console.log(`Area = ${area.toFixed(2)}`);



/*
run:

Area = 37.50

*/

 

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Answer 2

function area_regular_pentagon(side) {
    return (1 / 4) * Math.sqrt(5 * (5 + 2 * Math.sqrt(5))) * (side ** 2);
}

console.log(area_regular_pentagon(7));


/*
run:

84.30339262885938

*/

 

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