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Course 3 Chapter 8
Chapter 8 - Geometry Vocabulary
24
Mathematics
7th Grade
12/20/2010

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Term
acute triangle
Definition
a triangle with three acute angles
Term
adjacent angles
Definition
these angles share a vertex and a side but have no interior points in common
Term
alternate interior angles
Definition
these angles lie within a pair of lines and on opposite sides of a transversal
Term
angle bisector
Definition
this is a ray that divides an angle into angles of equal measure
Term
area
Definition
the number of square units a figure encloses.
Term
complementary
Definition
two angles are this if the sum of their measures is 90°
Term
congruent polygons
Definition
two polygons are this if they have exactly the same shape and size
Term
corresponding angles
Definition
these angles lie on the same side of the transversal and in corresponding position
Term
equilateral triangle
Definition
a triangle with three congruent sides
Term
isosceles triangle
Definition
a triangle with at least two congruent sides
Term
obtuse triangle
Definition
a triangle with one obtuse angle
Term
parallelogram
Definition
a quadrilateral with both pairs of opposite sides parallel
Term
perpendicular lines
Definition
lines that intersect to form right angles
Term
quadrilateral
Definition
a polygon with four sides
Term
rectangle
Definition
a parallelogram with four right angles
Term
regular polygon
Definition
a polygon with all sides congruent and all angles congruent
Term
rhombus
Definition
a parallelogram with four congruent sides
Term
right triangle
Definition
a triangle with one right angle
Term
scalene triangle
Definition
a triangle with no congruent sides
Term
square
Definition
a parallelogram with four right angles and four congruent sides
Term
supplementary
Definition
two angles whose measures add to 180°
Term
transversal
Definition
a line that intersects two or more lines at different points
Term
trapezoid
Definition
a quadrilateral with exactly one pair of parallel sides
Term
vertical angles
Definition
these angles are formed by two intersecting lines and are opposite each other
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