Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
What does the term "complementary angles" mean?
|
Two angles whose sum is 90 degrees. (They do not have to be adjacent)
|
|
What does the term "supplementary angles" mean?
|
Two angles whose sum is 180 degrees. (They do not have to be adjacent)
|
|
What does it mean for two lines to be "perpendicular"?
|
The two lines interesect to form 4 right (90 degree) angles.
The slopes of perpendicular lines are opposite reciprocals of one another. Ex: 2 and -1/2 |
|
What are "vertical angles"?
|
The nonadjacent angles formed by two intersecting lines.
In other words, the opposite angles in an X. They are always congruent to each other. |
|
What is a "linear pair"?
|
Two adjacent angles that make a line (add to 180 degrees).
|
|
What are "adjacent angles"?
|
Two angles that share a common side and a common endpoint but no common interior points.
In other words, two angles touching right next to each other. |
|
What is a "polygon"?
|
A closed figure with many sides.
|
|
What do we know about "similar triangles"?
|
Corresponding angles are congruent and corresponding sides are proportional.
They are the same shape but different sizes. |
|
What are the five abbreviated postulates/theorems used to prove triangles congruent?
|
SSS, SAS, ASA, AAS, and HL.
|
|
What is the interior angle sum of a triangle?
|
180 degrees
|
|
What is the total of all central angles in a circle?
|
360 degrees
|
|
What is the interior angle sum of a quadrilateral?
|
360 degrees
|
|
What is a dodecagon?
|
A 12-sided figure
|
|
What is an "altitude" of a triangle?
|
The segment that comes from an angle and is perpendicular to the opposite side (makes a right angle with the side).
Also called the "height". |
|
What do we call a figure with four congruent sides but not necessarily four congruent angles?
|
Rhombus
|