就是这个样的粗爆，手搓一个计算器：圆定理计算器

线上运行，可以直接打开：圆定理计算器(在线计算器)

       作为程序员，没有合适的工具，就得手搓一个，PC端，移动端均可适用。废话不多说，直接上代码。

HTML:

<div class="calculator"><label for="radius">圆的半径 (r)：</label> <input id="radius" step="0.01" type="number" placeholder="输入圆的半径"> <label for="chordLength">弦长 (l)（仅用于计算弦距）：</label> <input id="chordLength" step="0.01" type="number" placeholder="输入弦长"> <label for="chordDistance">弦距 (d)（仅用于计算弦长）：</label> <input id="chordDistance" step="0.01" type="number" placeholder="输入弦距"><button onclick="calculateCircle()">计算</button><div id="result" class="result">结果将显示在这里</div></div>

JS:

function calculateCircle() {
        const radius = parseFloat(document.getElementById('radius').value);
        const chordLength = parseFloat(document.getElementById('chordLength').value);
        const chordDistance = parseFloat(document.getElementById('chordDistance').value);

        if (isNaN(radius) || radius <= 0) {
            document.getElementById('result').textContent = "请输入有效的圆的半径。";
            return;
        }

        const circumference = 2 * Math.PI * radius;
        const area = Math.PI * Math.pow(radius, 2);

        let resultText = `圆的周长为：${circumference.toFixed(2)} 单位长度\n` +
                         `圆的面积为：${area.toFixed(2)} 平方单位\n`;

                    const angle = Math.acos((radius - chordDistance) / radius);                                
        if (!isNaN(chordLength) && chordLength > 0 && radius > 0) {
            const computedChordLength = 2 * radius * Math.sin(angle / 2);
            resultText += `计算的弦长为：${computedChordLength.toFixed(2)} 单位长度\n`;
        }

        if (!isNaN(chordDistance) && chordDistance > 0 && radius > 0) {
            const computedChordDistance = radius * (1 - Math.cos(angle / 2));
            resultText += `计算的弦距为：${computedChordDistance.toFixed(2)} 单位长度\n`;
        }

        document.getElementById('result').textContent = resultText;
    }

 CSS:

.calculator {
    width: 100%;
    background-color: #333;
    color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}


label {
    display: block;
    margin-bottom: 10px;
    font-size: 16px;
}

input, select {
    width: 100%!important;
    padding: 10px!important;
    margin-bottom: 20px;
       color: #000000; 
    border-radius: 5px;
    border: 1px solid #555;
    font-size: 16px!important;
    background-color: #ffffff!important;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background-color: orange;
}

.result {
  font-size: 18px;
    margin-top: 20px;
    text-align: center;
}

option {
        background-color: #ffffff;
}


p {
    font-size: 18px;
        margin-top: 5px!important;
}