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Geometry Vocabulary
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Gravity
Terms in this set (51)
Polygon
Plane figure that is formed by 3 or more segments called sides
Line Segment
Part of a line that consists of two endpoints
Angle
Two rays that have the same initial point
Transformation
Operation that maps or moves an image
Preimage
An original figure that is transformed to form an image
Image
A figure that results from the transformation of a geometric figure
Rigid Motion
a transformation in which the figure is still the same size and shape
Line
Extends forever in two directions
Rotation
a transformation that turns a figure about a fixed point
Translation
Transformation that moves all of the points on a figure the same distance in the same direction
Reflection
A transformation that "flips" a figure over a mirror or a line
Triangle
A polygon with three sides.
Parallel
Two lines in the same plane that do not intersect
Collinear
points on the same line
Trapezoid
a quadrilateral with one pair of parallel sides
Parallelogram
A quadrilateral with both pairs of opposite sides parallel.
quadrilateral
A four-sided polygon.
Perpendicular
Two rays, line segments or lines that meet to form a right angle
Regular polygon
A polygon with equal angles and equal sides.
Congruent
Having the same size and shape
Dilation
a transformation that enlarges or reduces the original figure proportionally
Similar Figures
have the same shape but not necessarily the same size
Rectangle
A parallelogram with four right angles
Rhombus
A parallelogram with four congruent sides
Square
A parallelogram with four congruent sides and four right angles.
Bisect
to divide into two equal parts
Hypotenuse
The side opposite the right angle in a right triangle.
Isosceles triangle
a triangle with two congruent sides
Scalene triangle
a triangle with no congruent sides
Equilateral
all sides are congruent
Circle
the set of all points in a plane that are equidistant from a given point
Acute triangle
A triangle that contains only angles that are less than 90 degrees.
Obtuse triangle
A triangle with one angle that is greater than 90 degrees.
Right triangle
a triangle with one angle of 90 degrees
Equiangular
all angles are congruent
Radius
The distance from the center of a circle to any point on the circle
Diameter
the distance across a circle through its center
Vertical angles
Complementary angles
two angles whose measures have a sum of 90 degrees
Supplementary angles
two angles whose measures have a sum of 180 degrees
Linear pair
Midpoint
A point that divides a segment into two congruent segments
Prism
Pyramid
Cylinder
Cone
Sphere
Corresponding
Angles or sides that have the same relative position in geometric figures
point
An exact location represented by a dot.
Ray
A part of a line, with one endpoint, that continues without end in one direction
Vertex
A point where two or more straight lines meet.
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