Cynthia Lanius

Thanks to PBS for permission to use the Pyramid photo.


geo (earth) - metry (to measure)

circle the set of all points in a plane a given distance from a given point.
congruent equal measure
hexagon a six-sided polygon
heptagon a seven-sided polygon
octagon an eight-sided polygon
parallelogram a quadrilateral with both pairs of opposite sides parallel
pentagon a five-sided polygon
similarfigures that have the same shape, but not necessarily the same size
rectangle a quadrilateral with 4 right angles
trapezoid a quadrilateral with exactly one pair of opposite sides parallel
    - isosceles a trapezoid with the un-parallel opposite sides congruent
triangle a 3-sided polygon
    - equilateral a triangle with all sides congruent
    - isosceles a triangle with at least two sides congruent
    - right a triangle with a right angle
    - scalene a triangle with no sides congruent

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