Question

How to calculate the area of a pentagon in PHP

Answer 1

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

$side = 5.0;
$apothem = 3.0;

$area = pentagon_area($side, $apothem);

echo "Area = " . number_format($area, 2) . "\n";


/*
run:

Area = 37.50

*/

 

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Answer 2

function area_regular_pentagon(float $side): float {
    return (1 / 4) * sqrt(5 * (5 + 2 * sqrt(5))) * ($side ** 2);
}

echo area_regular_pentagon(7), "\n";


/*
run:

84.303392628859

*/

 

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