Dissecting a Cube for a Regular Tetrahedron

Topic:Cube

When a cube is sliced at four corners using a plane containing three face diagonals, a regular tetrahedron is left in the middle after removing the four corners.

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Graphing a Circle in Polar Coordinates
Simple example: Colored circle
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A 3D Problem about Shadow
Shaders examples

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planetary modeling with power functions
fractions1
Even & Odd Functions
數字鐘YLMAY
Lines in the Coordinate Plane

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Statistical Characteristics
Poisson Distribution
Limits
Difference and Slope
Conditional Probability