Monotony breaks are necessary to keep learners' attention; not many teenagers can listen for more than 10-15 minutes. I've included different features in my class to keep students engaged. Visual illusions are great since my cognitive science background helps me tie concepts from perceptions to mathematics. Does the tower on the right side look as if it tilts more? Here, the two pictures of the famous Pisa Tower are in fact the same. They are parallel and share the same slope. In the classroom, I highlight their slope and reveal their congruence using an animated slide on PowerPoint.
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