Apply suggested fix to math-page.html from Copilot Autofix

Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>

Author: ajm19826

math-page.html

@@ -460,7 +460,7 @@ <h2 id="lessons-title">Old CoolMathTime lessons</h2>
           <div class="lesson-card"><h3>Integers & Rational Numbers</h3><a href="https://houselearning.org/home/math/bin/ratios.html" target="_blank" rel="noopener">Start Lesson</a></div>
           <div class="lesson-card"><h3>Ratios & Proportions</h3><a href="https://houselearning.org/home/math/bin/proportions.html" target="_blank" rel="noopener">Start Lesson</a></div>
           <div class="lesson-card"><h3>Angles & Shapes</h3><a href="https://houselearning.org/home/math/bin/angles.html" target="_blank" rel="noopener">Start Lesson</a></div>
-          <div class="lesson-card"><h3>Perimeter & Area</h3><a href="https://houselearning.org/home/math/bin/perimiter.html" target="_blank" rel="noopener">Start Lesson</a></div>
+          <div class="lesson-card"><h3>Perimeter & Area</h3><a href="https://houselearning.org/home/math/bin/perimeter.html" target="_blank" rel="noopener">Start Lesson</a></div>
           <div class="lesson-card"><h3>Volume & Surface Area</h3><a href="https://houselearning.org/home/math/bin/volumesurface.html" target="_blank" rel="noopener">Start Lesson</a></div>
           <div class="lesson-card"><h3>Graphing Equations</h3><a href="https://houselearning.org/home/math/bin/graphequations.html" target="_blank" rel="noopener">Start Lesson</a></div>
           <div class="lesson-card"><h3>Linear Functions</h3><a href="https://houselearning.org/home/math/bin/linearfunctions.html" target="_blank" rel="noopener">Start Lesson</a></div>