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Izidor Hafner
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Demonstrations 21  40 of 1313
Inequalities and Equations with Absolute Values
Area of a Polygon on the Integer Lattice
Area of a Triangle on an Integer Grid
Space Visualization Test on Prism Edges
Space Visualization Test on Pyramid Edges
Equations with Fractions
Addition and Subtraction of OneDecimal Numbers Using Rulers
Union and Intersection of Intervals
Division by Successive Subtraction
Vieta's Formula for Quadratic Polynomials
Is This Number a Prime?
3D Grill for Secret Writing
Sturm's Theorem for Polynomials
Penrose Rhombus Tilings by Projecting Golden Rhombi 2
A Grill for Secret Writing
Ison Triangles
Dissecting One Isonona Triangle into Two
Isonona Triangles for 3D Printing
Isonona Triangles
All 11 Folding Nets of the Regular Octahedron
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