Download Scott Foresman Addison Wesley, enVision Math

Topic 11
Name
Vocabulary Cards
point
point
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An exact position, often
marked by a dot.
line
A set of points that forms
an endless straight path in
opposite directions.
line
line segment
line segment
Topic 11 1 of 11
A part of a line with two
endpoints.
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Name
intersecting lines
Lines that cross at
one point.
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intersecting lines
parallel lines
Lines that never cross.
parallel lines
ray
A part of a line with only
one endpoint.
ray
Topic 11 2 of 11
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Name
angle
Two rays with the same
endpoint; that endpoint is
the vertex of the angle.
angle
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vertex of an angle
vertex of an angle
The endpoint of two rays
that form an angle.
right angle
An angle that makes a
square corner.
right angle
Topic 11 3 of 11
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Name
perpendicular
Two lines, line segments,
or rays that make a
right angle.
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perpendicular
acute angle
acute angle
An angle that is open less
than a right angle.
obtuse angle
obtuse angle
Topic 11 4 of 11
An angle that is open more
than a right angle.
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Name
polygon
polygon
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A closed figure made up
of line segments.
side
side
A line segment that forms
part of a polygon.
vertex of a polygon
The point where two sides
of a polygon meet.
vertex of a polygon
Vertex
Topic 11 5 of 11
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Name
diagonal
A line segment that
connects two vertices
of a polygon that are not
next to each other.
diagonal
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triangle
triangle
A polygon with
three sides.
quadrilateral
A polygon with four sides.
quadrilateral
Topic 11 6 of 11
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Name
pentagon
A polygon with five sides.
pentagon
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hexagon
A polygon with six sides.
hexagon
octagon
A polygon with
eight sides.
octagon
Topic 11 7 of 11
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Name
decagon
A polygon with
ten sides.
decagon
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equilateral triangle
equilateral triangle
A triangle having
three sides of the
same length.
isosceles triangle
isosceles triangle
Topic 11 8 of 11
A triangle with at least
two sides having the
same length.
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Name
scalene triangle
A triangle in which no
sides have the same
length.
scalene triangle
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right triangle
right triangle
A triangle in which one
angle is a right angle.
acute triangle
acute triangle
Topic 11 9 of 11
A triangle in which all three
angles are acute angles.
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Name
obtuse triangle
A triangle in which
one angle is an
obtuse angle.
obtuse triangle
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trapezoid
trapezoid
A quadrilateral with exactly
one pair of parallel sides.
parallelogram
parallelogram
Topic 11 10 of 11
A quadrilateral with
two pairs of parallel sides.
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Name
rectangle
A special parallelogram
with four right angles.
rectangle
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rhombus
rhombus
A special parallelogram
in which all sides are the
same length.
square
A special parallelogram
with four right angles and
all sides the same length.
square
Topic 11 11 of 11
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