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areaTrapezoid.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>
<body>
윗변: <input id='base1'> <br>
아랫변: <input id='base2'> <br>
높이: <input id='height'> <br>
<button onclick="trapezoid()"> 사다리꼴의 넓이 구하기 </button>
<p id="result"> </p>
</div>
<script>
function trapezoid() {
let b1 = Number(document.getElementById('base1').value);
let b2 = Number(document.getElementById('base2').value);
let h = Number(document.getElementById('height').value);
if (isNaN(b1) || isNaN(b2) || isNaN(h) || !b1 || !b2 || !h) {
document.getElementById('result').innerHTML = '빈칸이 있거나 숫자가 아닌 값이 들어있습니다.';
} else {
let trapezoidArea = ((b1 + b2)/2) * h;
document.getElementById('result').innerHTML = '사다리꼴의 넓이는 = ' + trapezoidArea;
}
}
</script>
</body>
</html>