Thanks to PBS for permission to use the Pyramid photo.

## Glossary

geo (earth) - metry (to measure)

circlethe set of all points in a plane a given distance from a given point. congruentequal measure hexagona six-sided polygon heptagona seven-sided polygon octagonan eight-sided polygon parallelograma quadrilateral with both pairs of opposite sides parallel pentagona five-sided polygon similarfigures that have the same shape, but not necessarily the same size rectanglea quadrilateral with 4 right angles trapezoida quadrilateral with exactly one pair of opposite sides parallel - isoscelesa trapezoid with the un-parallel opposite sides congruent trianglea 3-sided polygon - equilaterala triangle with all sides congruent - isoscelesa triangle with at least two sides congruent - righta triangle with a right angle - scalenea triangle with no sides congruent

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## Copyright 1997-2008 Cynthia Lanius