Download VocabCh10 - Etiwanda E

Plane figure
A two dimensional figure.
Chapter 10
polygon
A closed plane figure of 3 or more
line segments. They can have a
different number of sides and
angles.
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triangle
A 3 sided polygon with 3 angles.
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quadrilateral
A 4 sided polygon with 4 angles.
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pentagon
A 5 sided polygon with 5 angles.
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hexagon
A 6 sided polygon with 6 angles.
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octagon
An 8 sided polygon with 8 angles.
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perimeter
The distance around the outside of
an object or shape.
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area
The number of square units
needed to cover a plane figure
without overlapping.
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equilateral triangle
A triangle with 3 equal sides.
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isosceles triangle
A triangle with 2 equal sides.
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scalene triangle
A triangle with NO equal sides.
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right triangle
A triangle with one right angle.
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obtuse angle
Angle bigger than 90
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acute angle
Angle smaller than 90
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parallel
Lines that are the same distance
apart. Parallel lines do not meet.
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rectangle
Opposite sides are same length
and are parallel. It also has 4 right
angles.
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rectangular solid
A 3-dimensional figure with six faces
that are rectangles.
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square
4 sided that are the same length,
opposite sides are parallel, has 4
right angles.
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parallelogram
Opposite sides are the same length
and are parallel.
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cube
A 3-dimensional figure with 6
congruent square faces.
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cone
3-dimensional figure with a curved
surface and a circular base which
comes to a point called the
vertex.
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pyramid
A 3-dimensional figure with
5 faces.
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cylinder
A 3-dimensional figure having two
circular bases and a curved surface
connecting the two bases.
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sphere
A 3-dimensional figure that has the
shape of a round ball.
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volume
The number of cubic units needed to
fill a 3-dimensional figure or solid
figure.
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cubic unit
A unit for measuring volume, such as
a cubic inch or a cubic centimeter.
Chapter 10