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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גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
רישום חופשי
Noisy loop
Multiplying 4-Digit by 4-Digit Numbers Using an Area Model
Here comes the sun!

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s3-extra-hard
Integer Multiplication
Linear Equations in Two Variables-Class IX
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Difference and Slope
Pythagoras or Pythagorean Theorem
Subtraction
Quadratic Equations
Complex Numbers