• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/20

Click to flip

### 20 Cards in this Set

• Front
• Back
 Line Intersection Theorem Two different lines intersect at most at one point. Linear Pair Theorem If two angles form a linear pair, they are supplementary Vertical Angles Theorem If two angles are vertical angles, then they have equal measures Parallel Lines and Slopes Theorem Two nonvertical lines are parallel if an only if they have the same slope Transitivity of Parallelism Theorem: In a plane, if l // m and m // n, then l // n 2 Perpendiculars Theorem If 2 coplanar lines l and m are each peprpindicular to the same line, then they are parallel to each other Perpindiculars to Parallels Theorem In a plane, if a line is perpendicular to one of 2 parallel lines, then it is also perpindicular to the other Perpindicular Lines and Slopes Theorem 2 nonvertical lines are perpendicular if and only if the product of their slopes is -1 Figure Reflection Theorem If a figure us determined by certain points, thenits reflection image is the corresponding figure determined by the reflection images of those points 2 Reflection Theorem for Translations If m // l, the translation over line l then m has magnitude 2 times the distance between l and m, in the direction from l perpendicular to m Two Reflection Theorem for Rotations If m intersects l, the rotation over line l then m has center at the point of intersection of m and l and has magnitude twice the measure of the non-obtuse angle formed by these lines, in the direction fro l to m Corresponding Parts of Confruent Figures (CPCF) Theorem IF 2 figures are congruent, then any pair of corresponding parts is congruent A-B-C-D Theorem Every isometry preserves angle measure, betweeness, collinearity (lines), and distance (lenghts of segments) Reflexive Property of Congruence F is congruent to F Symmetric Property of Congruence If F is congruent to G, then G is congruent to F Transitive Property of Congruence If F is congruent to G and G is congruent to H, then F is congruent to H Segment Congruence Theorem 2 segements are congruent if and only if they have the same length Angle Congruence Theorem 2 angles are congruent if and only if they have the sam measure Euclid's First Theorem If circle A contains points B and Circle B contains point A and the circles intersect at C, then triangle ABC is equilateral // Lines Þ AIA congruence theorem If 2 parallel lines are cut by a transversal, then alternate interior angles are congruent