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  <title>Math Formula with var</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7;font-size:.95rem}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}var{font-style:italic}</style>

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  <h1>Circle Area Formula</h1>

  <p>The area of a circle is calculated using the formula A = &pi;<var>r</var><sup>2</sup>.</p>

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HTML var Tag — Mathematical Formula