Polygon in Polygon

Topic:Area

James Tanton, inspired by Vincent Pantaloni, tweeted an image I misunderstood, then found something cool. Leaves me wondering why the area case is different for n=4. Tanton tweet

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Exploding cube
Silhouettes without gaps and isolated
koch tool
bewijs stelling van Pythagoras
apec

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Trig
Batman
Measuring Circumference and Diameter
Triunghi Podar Brocard..
trisekcija ... proporcija uglova
Ejercicio 2

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Trigonometric Functions
Expected Value
Polynomial Functions
Dilation
Matrices