Interchangeable lessons depending what suits your interest.
Listed from Kindergarten to Sixth Grade.

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Circles

https://www.wassilykandinsky.net/painting1896-1944.php

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Hexagon Color Wheel

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Stomachion Puzzle

https://www.instructables.com/Making-a-Stomachion/

StomachionPuzzlePieces.pdf

Archimedes Ostomachion Puzzle

Fractal Tree

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Triangle Party

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Infinite Circles

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Stars – Multi Pointed

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Fibonacci Sequence, Spirals

Fibonacci Number sequence . . .in nature, design,
https://kids.kiddle.co/Fibonacci
https://kids.kiddle.co/Fibonacci_number
https://kids.kiddle.co/Golden_ratio
What is the radius, diameter and circumference of a circle?
https://www.kidsmathgamesonline.com/facts/geometry/circles.html

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More!

Sunflower Challenge

Print the pdf and count how many spirals in each direction.

sunflower.fibonacci

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Print and color Hexagon pages – Hexagon Grids

 

 

Print and color Tumbling Block pages – Tumbling Block Grid

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How Many Triangles?

Print and try your skills at counting how many
triangles you can find in a variety of shapes . . .

Triangles – How many triangles?

 

Hexagon – How many triangles?  And how many hexagons?

 

Hexagon – How many triangles?

 

Square – How many triangles? And how many squares?

 

Rectangle – How many triangles? And how many rectangles?

 

9 Point Star – How many triangles?

 

Kite – How many triangles?