<h1 id="circles">Circles<a aria-hidden="true" class="anchor-heading icon-link" href="#circles"></a></h1>
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<h2 id="key-ideas">Key Ideas<a aria-hidden="true" class="anchor-heading icon-link" href="#key-ideas"></a></h2>
<p>Features of a circle<br>
<strong>Diameter</strong> (<span class="math math-inline"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>d</mi></mrow><annotation encoding="application/x-tex">d</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">d</span></span></span></span></span>) is the distance across the centre of a circle.</p>
<p><strong>Radius</strong> (<span class="math math-inline"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>C</mi></mrow><annotation encoding="application/x-tex">C</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6833em;"></span><span class="mord mathnormal" style="margin-right:0.07153em;">C</span></span></span></span></span>) is the distance around a circle </p>

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