   
            <div class="content"><div class='highlight'><pre>        <span class="hljs-keyword">new</span> c3.Polar.Layer.Pie&lt;<span class="hljs-built_in">number</span>&gt;({
            key: <span class="hljs-function">(<span class="hljs-params">d</span>) =&gt;</span> d,
            value: <span class="hljs-function">(<span class="hljs-params">d</span>) =&gt;</span> d,
            inner_radius: <span class="hljs-number">0.55</span>,
            outer_radius: <span class="hljs-number">0.5</span>,
    