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+---
+title: Math.sqrt()
+slug: Web/JavaScript/Reference/Global_Objects/Math/sqrt
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/sqrt
+---
+<div>{{JSRef}}</div>
+
+<p> <strong><code>Math.sqrt()</code></strong> 함수는 숫자의 제곱근을 반환합니다.</p>
+
+<p><math display="block"><semantics><mrow><mo>∀</mo><mi>x</mi><mo>≥</mo><mn>0</mn><mo>,</mo><mstyle mathvariant="monospace"><mrow><mi>M</mi><mi>a</mi><mi>t</mi><mi>h</mi><mo>.</mo><mi>s</mi><mi>q</mi><mi>r</mi><mi>t</mi><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow></mstyle><mo>=</mo><msqrt><mi>x</mi></msqrt><mo>=</mo><mtext>the unique</mtext><mspace width="thickmathspace"></mspace><mi>y</mi><mo>≥</mo><mn>0</mn><mspace width="thickmathspace"></mspace><mtext>such that</mtext><mspace width="thickmathspace"></mspace><msup><mi>y</mi><mn>2</mn></msup><mo>=</mo><mi>x</mi></mrow><annotation encoding="TeX">\forall x \geq 0, \mathtt{Math.sqrt(x)} = \sqrt{x} = \text{the unique} \; y \geq 0 \; \text{such that} \; y^2 = x</annotation></semantics></math></p>
+
+<h2 id="문법">문법</h2>
+
+<pre class="syntaxbox"><code>Math.sqrt(<var>x</var>)</code></pre>
+
+<h3 id="매개변수">매개변수</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>숫자.</dd>
+</dl>
+
+<h3 id="반환_값">반환 값</h3>
+
+<p>주어진 숫자에 루트(<strong>√ </strong>)를 씌웁니다. 만약 숫자가 음수이면 {{jsxref("NaN")}}를 반환합니다.</p>
+
+<h2 id="설명">설명</h2>
+
+<p>만약 <code>x</code> 가 음수라면 <code>Math.sqrt()</code> 함수는 {{jsxref("NaN")}}를 반환합니다.</p>
+
+<p><code>sqrt()</code>는 <code>Math</code>의 정적 메서드 이므로 만든  <code>Math</code> 객체의 메서드가 아니라 항상 <code>Math.sqrt()</code>함수를 사용해야합니다. (<code>Math</code>는 생성자가 없습니다.)</p>
+
+<h2 id="예제">예제</h2>
+
+<h3 id="Math.sqrt()"> <code>Math.sqrt()</code></h3>
+
+<pre class="brush: js">Math.sqrt(9); // 3
+Math.sqrt(2); // 1.414213562373095
+
+Math.sqrt(1);  // 1
+Math.sqrt(0);  // 0
+Math.sqrt(-1); // NaN
+</pre>
+
+<h2 id="표준">표준</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">표준</th>
+   <th scope="col">상태</th>
+   <th scope="col">비고</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.0.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.8.2.17', 'Math.sqrt')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.sqrt', 'Math.sqrt')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-math.sqrt', 'Math.sqrt')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.Math.sqrt")}}</p>
+
+<h2 id="참조">참조</h2>
+
+<ul>
+ <li>{{jsxref("Math.cbrt()")}}</li>
+ <li>{{jsxref("Math.exp()")}}</li>
+ <li>{{jsxref("Math.log()")}}</li>
+ <li>{{jsxref("Math.pow()")}}</li>
+</ul>