es.html"><a href="directions-rotations-and-hyperspheres.html"><i class="fa fa-check"></i><b>11</b> Directions, Rotations, and Hyperspheres</a><ul>
<li class="chapter" data-level="11.1" data-path="unit-vectors.html"><a href="unit-vectors.html"><i class="fa fa-check"></i><b>11.1</b> Unit Vectors</a></li>
<li class="chapter" data-level="11.2" data-path="circles-spheres-and-hyperspheres.html"><a href="circles-spheres-and-hyperspheres.html"><i class="fa fa-check"></i><b>11.2</b> Circles, Spheres, and Hypersphere