| Abscissa |
The First element, or
x-coordinate, of an ordered pair. |
| Acute angle |
An angle that has a
measure between 0o and 90o |
| Acute triangle |
A triangle that has three
acute angles. |
| Adjacent angles |
Two angles that share a
common side but do not overlap each other. |
| Angle |
The union of two
non-collinear rays with a common endpoint. |
| Angle of depression |
The angle formed by the
horizontal and the line of sight to an object below the horizontal |
| Angle of elevation |
The angle formed by the
horizontal and the line of sight to an object above the horizontal |
| Axis of symmetry |
The line passing through
the vertex of the parabola on which it can be folded to have the
two halves coincide |
| Closed half-plane |
The graph of a linear
inequality that includes its boundary line. |
| Complementary angles |
Two angles whose measures
have a sum of 900 |
| Congruent angles |
Angles that have the same
measure. |
| Congruent figures |
Figures that have the same
size and shape |
| Corresponding parts |
The angles, sides and
vertices that are in the same location in congruent figures. |
| Equilateral triangle |
A triangle with three sides
of equal length. |
| Graph of a number |
The point paired with a
number on the number line |
| Isosceles Triangle |
A triangle that has at least
two sides of equal length. |
| Obtuse angle |
An angle that has a measure
between 90o and 180o |
| Obtuse triangle |
A triangle that has one
obtuse angle |
| Ordinate |
The second element, or
y-coordinate, of an ordered pair |
| Pythagorean theorem |
In a right triangle, the
square of the length of the hypotenuse is equal to the sum of the
squares of the lengths of the sides. |
| Quadrants |
The four regions formed by
the axes in a coordinate plane. |
| Supplementary angles |
Two angles whose measures
have a sum of 180o |
| Tangent |
In a right triangle, the
tangent of an acute angle is the ratio of the length of the leg
opposite the angle to the length of the leg adjacent to the angle. |
| Triangle |
A figure formed by three
segments joining three noncollinear points |
| Venn diagram |
A pictorial
representation of sets. |
| x-axis |
The horizontal number
line in the coordinate plane |
| x-coordinate |
The first element in a
set of ordered pairs, also called the abscissa |
| x-intercept |
The x-coordinate of the
point where a graph intercepts the x-axis |
| y-axis |
The vertical number line
in the coordinate plane |
| y-coordinate |
The second element in a
set of ordered pairs, also called the ordinate. |
| y-intercept |
The y-coordinate of the
point where a graph intercepts the y-axis. |
