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<p><code class="code">hypot&nbsp;x&nbsp;y</code> returns <code class="code">sqrt(x&nbsp;*.&nbsp;x&nbsp;+&nbsp;y&nbsp;*.&nbsp;y)</code>, that is, the length
    of the hypotenuse of a right-angled triangle with sides of length
    <code class="code">x</code> and <code class="code">y</code>, or, equivalently, the distance of the point <code class="code">(x,y)</code>
    to origin.  If one of <code class="code">x</code> or <code class="code">y</code> is infinite, re