unit 9 Flashcards
-acute angle:
an angle measuring less than 90
-angle:
a figure formed by 2 rays that share a common endpoint
-angle congruency marks:
angle marks indicating angles of the same
measure
-area:
the number of square units needed to cover a surface
-bases of a right rectangular prism:
any congruent, opposite, and parallel
faces shaped like rectangles; exactly 3 possible sets
-congruent:
having the same size and shape
-edge:
the line segment where two faces of a solid figure meet
-equation:
a number sentence that uses the equal sign to show two
expressions are equivalent
-equiangular:
all angles in a polygon are congruent in measure
-equilateral:
all side lengths of a polygon are congruent in measure
-face:
a flat surface of a three-dimensional solid figure
-height of a rectangular prism:
the length of a side that is perpendicular to
both sides
-obtuse angle:
an angle that measuring more than 90o but less than 180o
-polygon:
a closed figure made of line segments
-positive rational numbers:
a number that can be written as !
“
in which
number a and b are counting (natural) numbers but b is not equal to 0
-prism:
a three-dimensional figure containing two congruent and parallel faces
that are polygons
-properties of triangles:
relationships of attributes within a triangle
(e.g., an equilateral triangle has all sides and angles congruent, the sum of the
lengths of two sides of a triangle is always greater than the length of the third
side, the sum of the angles of a triangle is always 180o; etc.)
-right angle:
an angle with a measure of 90o
-side congruency marks:
side marks indicating side lengths of the measure
-three-dimensional figure:
a solid figure that has length, width and height
-triangle:
a polygon with 3 sides and 3 angles
-triangle inequality theorm:
the sum of the lengths of any two sides of a
triangle is greater than the length of the third side
-two-dimensional figure:
a plane figure that has length and width
-unit rate:
a comparison of two measures with one term having a value of 1;
may also be called unit price or unit cost
-vertex (vertices):
the point where two rays meet, where two sides of a
polygon meet, or where the edges of a three-dimensional figure meet; the top
point of a cone or pyramid
-volume:
the number of cubic units needed to fill the space occupied by a
solid
