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geometry math terms
things from triangles to planes to congruent figures
36
General Vocab
7th Grade
03/03/2009

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Term
triangle
Definition
polygon with 3 sides.
Term
quadrilateral
Definition
polygon with 4 sides.
Term
pentagon
Definition
polygon with 5 sides.
Term
polygon
Definition
a geometric figure with 3 or more sides and angles.
Term
hexagon
Definition
polygon with 6 sides.
Term
heptagon
Definition
polygon with 7 sides.
Term
octagon
Definition
polygon with 8 sides.
Term
nonagon
Definition
polygon with 9 sides.
Term
decagon
Definition
polygon with 10 sides.
Term
square
Definition
parallelogram with 4 right angles and 4 congruent sides.
Term
rectangle
Definition
parallelogram with 4 right angles.
Term
rhombus
Definition
parallelogram with 4 congruent sides.
Term
trapezoid
Definition
quadrilateral with exactly one pair of opposite sides parallel.
Term
parallelogram
Definition
quadrilateral with opposite sides parallel and opposite sides congruent.
Term
transformation
Definition
any kind of movement of a geometric figure.
Term
translation
Definition
figures that slide from one location to another without changing size or shape.
Term
rotation
Definition
figures that are turned without changing size or shape.
Term
reflection
Definition
figures that are flipped over a line without changing size or shape.
Term
volume
Definition
number of cubic units needed to fill the space occupied by a solid.
Term
perimeter
Definition
distance around a geometric figure.
Term
area
Definition
number of square units needed to cover a surface enclosed by a geometric figure.
Term
surface area
Definition
sum of the areas of all the faces of a three-dimensional figure.
Term
circle
Definition
set of all points in a plane that are the same distance from a given point.
Term
regular polygon
Definition
polygon with all sides congruent
and all angles congruent.
Term
straight angle
Definition
angle that is exactly 180°.
Term
acute angle
Definition
angles that is less than 90°.
Term
vertex
Definition
point of intersection of two sides of polygon.
Term
obtuse angle
Definition
angle that is between 90° and 180°.
Term
right angle
Definition
angle that is exactly 90°.
Term
diagonal
Definition
segment that joins two vertices of a polygon but is not a side.
Term
angle
Definition
figure formed by two rays that begin at the same point.
Term
complementary angle
Definition
angles that add up to 90°.
Term
supplementary angles
Definition
angles that add up to 180°.
Term
congruent figures
Definition
figures that are the same size and same shape
Term
similar figures
Definition
figures that are the same shape and may or may not have same size.
Term
line of symmetry
Definition
place where a figure can be folded so that both halves are congruent.
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