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| • the first element in a coordinate pair.|
When graphed in the coordinate plane, it is the distance from the y-axis.
Frequently called the x coordinate.
|• an angle whose measure is between 0 ˚ and 90 ˚|
|• a triangle with three acute angles.|
|• two numbers whose sum is 0|
| • two angles that share a vertex and a common side between them but have no interior points in common.|
< ABC and < CBD are adjacent.
|• a step-by-step procedure for carrying out computation.|
| • two angles that are in opposite locations when lines are cut by a transversal.|
If the angles are between the lines, they are called alternate interior angles;
if they are outside the lines, they are called alternate exterior angles.
If the lines are parallel, the alternate angles are congruent.
c and f
d and e
a and h
b and g
|• length from the uppermost point of a triangle to the line opposite.|
| • when performing an operation on three or more numbers, the result is unchanged by the way the numbers are grouped.|
Addition and multiplication of numbers are associative since a+(b+c)=(a+b)+c and (ab)c=a(bc).
i.e. 6 + (7 + 9) = (6 + 7) + 9 and (4 x 3) x 5 = 4 x (3 x 5).
• Subtraction and division are not associative.
i.e. (8 / 4) / 2 and 8 / (4 / 2) are not equal.
| • the horizontal and vertical lines that form the quadrants of the coordinate plane.|
The horizontal axis is usually called the x-axis. The vertical axis is usually called the y-axis.