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trapezoid

a quadrilateral with exactly one pair of parallel sides

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isosceles

triangle with two equal sides

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octogon

a polygon with eight sides

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polygon

a closed plane figure with straight sides

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center

the point inside a circle that is the same distance from each point on the circle

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diameter

the distance across a circle through its center

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compass

a tool used to make circles

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equilateral triangle

a triangle with three equal sides and three equal angles

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hexagon

a polygon with six sides

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pentagon

a polygon with five sides

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triangle

a polygon with three sides

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square

a parallelogram with four equal sides

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parallelogram

a quadrilateral with two pairs of parallel sides

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scalene triangle

a triangle with no equal sides

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quadrilateral

a polygon with four sides and four angles

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radius

a line segment with one endpoint at the center of a circle and the otehr endpoint on the circle

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circle

a closed plain figure made up of all the points the same distance from the center

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obtuse triangle

a triangle with one obtuse angle

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acute triangle

a triangle with three acute angles

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right triangle

a triangle with one right angle

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