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11 Cards in this Set

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An equation that shows a mathematical relationship.
formula
A polygon with ten sides and ten angles.
decagon
A polygon with six sides and six angles.
hexagon
Changing numbers to other numbers that form a basic fact to estimate an answer.
compatible numbers
A polygon with congruent sides and congruent angles.
regular polygon
A number to be divided.
dividend
A three-sided polygon.
triangle
A 4-sided polygon.
quadrilateral
Another name for 2-dimensional figure.
plane figure
A flat surface that is endless in all directions.
plane
A polygon with eight sides and eight angles.
octagon