###
trapezoid

a quadrilateral with exactly one pair of parallel sides

###
isosceles

triangle with two equal sides

###
octogon

a polygon with eight sides

###
polygon

a closed plane figure with straight sides

###
center

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

###
diameter

the distance across a circle through its center

###
compass

a tool used to make circles

###
equilateral triangle

a triangle with three equal sides and three equal angles

###
hexagon

a polygon with six sides

###
pentagon

a polygon with five sides

###
triangle

a polygon with three sides

###
square

a parallelogram with four equal sides

###
parallelogram

a quadrilateral with two pairs of parallel sides

###
scalene triangle

a triangle with no equal sides

###
quadrilateral

a polygon with four sides and four angles

###
radius

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

###
circle

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

###
obtuse triangle

a triangle with one obtuse angle

###
acute triangle

a triangle with three acute angles

###
right triangle

a triangle with one right angle

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