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Math
Geometry
Symmetry
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Terms in this set (18)
line of symmetry
a line that divides a figure into two halves that are mirror images of each other
line symmetry (reflectional symmetry)
If a figure can be folded so two parts match exactly
right triangle
A triangle that forms a square corner
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.
angle
formed by two rays or line segments that share an endpoint
vertex
The common endpoint of an angle
Right angle
Square right corner = to exactly 90 degrees
acute angle
an angle that measures less than 90 degrees
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
straight angle
an angle that measures 180 degrees
point
an exact location in space
line
a straight path that extends without end in opposite directions
ray
A part of a line, with one endpoint, that continues without end in one direction
line segment
part of a line with two endpoints
parallel lines
lines in the same plane that never intersect
intersecting lines
lines that cross at one point
perpendicular lines
Lines that intersect to form right angles
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