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Valeri173

Nov 29th, 2021

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<!DOCTYPE html>
<html lang="bg">
<head>
<meta charset="UTF-8">
<title>Лице на кръг</title>
</head>
<body>
<h2>Калкулатор за лице на кръг</h2>
<label for="r">Въведете радиус:</label>
<input type="number" id="r"><br><br>
<button onclick="circleArea()">Изчисли</button>
<button onclick="clearValue()">Изчисти</button>
<p id="result"></p>
<script>
function circleArea() {
let r = parseFloat(document.getElementById("r").value);
let S = Math.PI * Math.pow(r, 2);
if (r !== null && r !== " " && r > 0)
document.getElementById("result").innerHTML = "Лицето на кръга е " + S.toFixed(4) + ".";
else
document.getElementById("result").innerHTML = "Грешна стойност на радиус!";
}
function clearValue() {
document.getElementById("r").value = "";
document.getElementById("result").innerHTML = "";
}
</script>
</body>
</html>

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