Geometrylessons.github May 2026
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.card-header p font-size: 0.85rem; opacity: 0.85; margin-top: 0.2rem; geometrylessons.github
<div class="quiz-footer"> <button class="reset-btn" id="resetQuizBtn">⟳ Reset quiz</button> <div class="quiz-score" id="scoreDisplay">Score: 0 / 6</div> </div> </div> <hr /> <footer> geometrylessons.github — comprehensive review • theorems, formulas & practice • always keep your protractor ready! </footer> </div> <div id="quiz-container"> <
<!-- Triangles & Congruence --> <div class="card"> <div class="card-header"> <h2>🔺 Triangles & Congruence</h2> <p>SSS · SAS · ASA · AAS · HL</p> </div> <div class="card-content"> <div class="formula">∠A + ∠B + ∠C = 180°</div> <div class="formula">Pythagoras: a² + b² = c² (right triangle)</div> <ul class="fact-list"> <li><strong>SSS</strong> : all three sides equal → congruent</li> <li><strong>SAS</strong> : two sides & included angle</li> <li><strong>ASA / AAS</strong> : two angles & a side</li> <li>HL only for right triangles (hypotenuse-leg)</li> </ul> <div class="theorem"> 🧠 Triangle Inequality: sum of any two sides > third side </div> </div> </div> .card-header p font-size: 0.85rem
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