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<!-- Quadrilaterals & Polygons --> <div class="card"> <div class="card-header"> <h2>⬛ Polygons & Quadrilaterals</h2> <p>properties · area formulas</p> </div> <div class="card-content"> <div class="formula">Sum of interior angles = (n-2)·180°</div> <div class="formula">Each interior angle (regular n-gon) = (n-2)·180°/n</div> <ul class="fact-list"> <li>Parallelogram: opposite sides parallel & congruent</li> <li>Rectangle: all angles 90°, diagonals congruent</li> <li>Rhombus: all sides equal, diagonals ⟂ bisectors</li> <li>Square = rectangle + rhombus</li> <li>Trapezoid: exactly one pair of parallel sides</li> </ul> </div> </div>

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