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15 Cards in this Set
- Front
- Back
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What does the term "complementary angles" mean?
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Two angles whose sum is 90 degrees. (They do not have to be adjacent)
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What does the term "supplementary angles" mean?
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Two angles whose sum is 180 degrees. (They do not have to be adjacent)
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What does it mean for two lines to be "perpendicular"?
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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 |
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What are "vertical angles"?
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The nonadjacent angles formed by two intersecting lines.
In other words, the opposite angles in an X. They are always congruent to each other. |
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What is a "linear pair"?
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Two adjacent angles that make a line (add to 180 degrees).
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What are "adjacent angles"?
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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. |
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What is a "polygon"?
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A closed figure with many sides.
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What do we know about "similar triangles"?
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Corresponding angles are congruent and corresponding sides are proportional.
They are the same shape but different sizes. |
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What are the five abbreviated postulates/theorems used to prove triangles congruent?
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SSS, SAS, ASA, AAS, and HL.
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What is the interior angle sum of a triangle?
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180 degrees
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What is the total of all central angles in a circle?
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360 degrees
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What is the interior angle sum of a quadrilateral?
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360 degrees
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What is a dodecagon?
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A 12-sided figure
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What is an "altitude" of a triangle?
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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". |
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What do we call a figure with four congruent sides but not necessarily four congruent angles?
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Rhombus
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