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Geometry Terms 4th Grade
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Terms in this set (22)
acute angle
an angle that is more than zero degrees and less than 90 degrees
obtuse angle
an angle that is more than 90 degrees and less than 180 degrees
right angle
an angle that is 90 degrees and is formed by perpendicular lines
point
an exact location in space
line
a straight path of points in a plane that continues without end in both directions with no end points.
line segment
a part of a line that includes 2 end points and all the points between them.
ray
a part of a line. It has one endpoint and continues without end in one direction.
angle
a shape formed by two line segments or rays that share the same endpoint.
straight angle
an angle whose measure is 180 degrees
intersecting lines
lines that cross each other at exactly one point
perpendicular line
2 lines that intersect to from four right angles
parallel lines
lines in the same plane that never intersect and are always the same distance apart
acute triangle
a triangle that measures greater than zero degrees and less than 90 degrees
right triangle
a triangle that has one angle that is 90 degrees
obtuse triangle
a triangle that has one angle that is more than 90 degrees
quadrilateral
a polygon with four sides and four angles
square
a quadrilateral with two pairs of parallel sides,four sides of equal length and four right angles.
rectangle
a quadrilateral with two pairs of parallel sides, two pairs of sides of equal length and four right angles.
parallelogram
a quadrilateral whose opposite sides are parallel and of equal length
rhombus
a quadrilateral with two pairs of parallel sides and four sides of equal length
trapezoid
a quadrilateral with exactly one pair of parallel sides
line symmetry
Something can have symmetry if a line can separate the figure into two equal parts. Each part looks exactly the same.
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