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areaCylinder.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
반지름: <input id='radius'> <br>
높이: <input id='height'> <br>
<button onclick="cylinder()"> 원기둥의 넓이 구하기 </button>
<p id="result"> </p>
</div>
<script>
//2 * (밑넓이) + (옆넓이) = 2*파이*반지름제곱 + 2*파이*반지름*높이
function cylinder() {
let r = Number(document.getElementById('radius').value);
let h = Number(document.getElementById('height').value);
if (isNaN(r) || isNaN(h) || !r || !h) {
document.getElementById('result').innerHTML = '빈칸이 있거나 숫자가 아닌 값이 들어있습니다.';
} else {
let p = Math.PI
let cylinderArea = (2 * p * Math.pow(r, 2)) + (h * 2 * p * r);
document.getElementById('result').innerHTML = '원기둥의 넓이는 = ' + cylinderArea;
}
}
</script>
</body>
</html>