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Euclid’s five postulates are the basis of the logical structure of his geometry.
By Janet Grischy

Medians and altitudes in triangles are both ways to divide the inside of a triangle, but they have important differences to remember.
By Jen Adams

Euclidean geometry is useful for determining the areas, volumes and perimeters of many different shapes.
By Janet Grischy

Symmetry takes many shapes and sizes and is found in biology, nature and mathematics.
By Janet Grischy

There are only five Platonic solids, the tetrahedron, cube, dodecahedron, icosahedron and octahedron.
By Janet Grischy
