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20 terms

Geometry Vocabulary

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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