Opening a cube

Topic:Cube

A cube is divided into 6 congruent right pyramids. Drag the yellow dot to 'close' the cube. This shows the volume of a square base pyramid with height equal to half its base edge.

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Here comes the sun!
'Einstein' tile vitral
A Happy Polar Leaf
Vectors and Components - Trig
Vectors and Components

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Absolute value with Above(t) and Below(t)
SAS Construction
Trigonometri - drage

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Correlation
General Quadrilateral
LCM and GCD
Ellipse
Natural Numbers