geometry vocabulary test words
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| the set of all points in a plane that are the same distance from a given point | circle
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| lines that lie in different planes that are neither parallel nor intersecting | skew
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| a straight path that extends without end in opposite directions | line
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| a flat surface that extends forever | plane
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| a part of a circle named by its endpoints | arc
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| the point where two sides intersect | vertex
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| lines that intersect to form right angles | perpendicular lines
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| a part of a line that starts at one endpoint and extends forever | ray
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| an angle that measures less than 90 degrees | acute angle
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| line segment with one endpoint at the center of a circle, the other endpoint on the circle | radius
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| having the same size and shape | congruent
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| a part of a line between two endpoints | line segment
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| two angles whose measures add to 90 degrees | complementary angles
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| an angle that measures 180 degrees | straight angle
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| The part of a circle enclosed by two radii and an arc connecting them | sector
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| a figure formed by two rays with a common endpoint | angle
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| a pair of opposite congruent angles formed by intersecting lines | vertical angles
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| an angle whose measure is greater than 90degrees but less than 180 degrees | obtuse angle
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| a line segment that passes through the center of a circle and has endpoints on the circle | diameter
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| an exact location in space | point
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| two angles whose measures have a sum of 180 degrees | supplementary angles
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| the point inside a circle that is the same distance from all points on the circle | center of the circle
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| an angle that measures 90 degrees | right angle
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| lines in a plane that do not intersect | parallel lines
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| a line segment with endpoints on a circle | chord
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| a line that intersects two or more lines | transversal
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| An angle formed by two radii | central angle
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| a closed plane figure formed by three or more line segments. | polygon
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| A line bounding a geometric figure | side
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| The point where two sides of a polygon intersect | vertex of a polygon
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| a polygon in which all sides are congruent and all angles are congruent | regular polygon
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| a triangle that has no congruent sides | scalene triangle
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| a triangle that has at least 2 congruent sides | isosceles triangle
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| a triangle with all sides congruent | equilateral triangle
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| a triangle with all angles less than 90 degrees | acute triangle
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| a triangle that has one obtuse angle | obtuse triangle
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| a triangle that has one right angle | right triangle
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| a quadrilateral with two pairs of parallel sides | parallelogram
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| a parallelogram with all sides congruent | rhombus
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| a parallelogram with 4 right angles | rectangle
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| a rectangle with 4 congruent sides | square
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| a quadrilateral with exactly one pair of parallel sides | trapezoid
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| a quadrilateral with two pairs of adjacent congruent sides | kite
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| A line segment that connects two non-adjacent vertices of a polygon | diagonal
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| A rule stating that if three sides of one triangle are congruent to three sides of another triangle, the triangles are congruent. | side-side-side rule
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| one-half is a mirror-image of the other half | line symmetry
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| The imaginary “mirror” in line symmetry | line of symmetry
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| Not identical on either side of a central line; not symmetrical | asymmetry
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| A figure has rotational symmetry if it can be rotated less than 360° around a central point and coincide with the original figure | rotational symmetry
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| The point about which a figure is rotated | center of rotation
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| A change in size or position of a figure | transformation
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| A figure resulting from a transformation | image
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| A movement (slide) of a figure along a straight line | translation
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| A transformation in which the figure is turned around a point | rotation
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| A transformation of a figure that flips the figure across a line | reflection
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| A line that a figure is flipped across to create a mirror image of the original figure | line if reflection
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| a polygon with 3 sides | triangle
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| a polygon with 4 sides | quadrilateral
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| a polygon with 5 sides | pentagon
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| a polygon with 6 sides | hexagon
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| a polygon with 7 sides | heptagon
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| a polygon with 8 sides | octagon
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| a polygon with 9 sides | nonagon
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| a polygon with 10 sides | decagon
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Created by:
mschuster
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