ame">b</span>, </span> <span class="parameter" id="lerp-param-t"><span class="type-annotation"><a href="dart-core/double-class.html">double</a></span> <span class="parameter-name">t</span></span>)
      
    </section>
    <section class="desc markdown">
      <p>Linearly interpolate between two radii.</p>
<p>If either is null, this function substitutes <a href="dart-ui/Radius/zero-constant.html">Radius.zero</a> instead.</p>
<p>The <code>t</code> argument represents position on the timeline, with 0.0 meanin