Ch. 3 First Quiz Flashcards
Pt. Parallel Postulate
If there is a line and a pt. not on the line, then there is exactly one line through that pt., parallel to the given line.
Pt. Perpendicular Postulate
If there is a line and a pt. not on the line, then there is exactly one line through that pt., perpendicular to the given line.
Corresponding Angles
Angles that are in the same position.
Alternate Interior Angles
Alternating the inside of the line
Alternate Exterior Angles
Alternating the outside of the line
Consecutive or same-side interior angles
Two consecutive angles that add up to 180 degrees on the inside of the line
Corresponding Angles Postulate (CAP)
If two parallel lines are cut by a transversal, then the pairs of corresponding angles are congruent.
Alternate Interior Angles Theorem (AIAC)
If two parallel lines are cut by a transversal, then alternate interior angles are congruent.
Alternate Exterior Angles Theorem (AEAC)
If two parallel lines are cut by a transversal, then alternate exterior angles are congruent.
Consecutive Interior Angles Theorem (SSIS)
If two parallel lines are cut by a transversal, then consecutive interior angles are supplementary.
Converse Corresponding Angle Postulate (CCAP)
If two parallel lines are cut by a transversal so that corresponding angles are congruent, then the lines are parallel.
CAIAC
Alternate interior angles are congruent if two parallel lines are cut by a transversal.
CSSIS
Consecutive interior angles are supplementary if two parallel lines are cut by a transversal.
CAEAC
Alternate exterior angles are congruent if two parallel lines are cut by a transversal.
Three parallel lines theorem.
If two lines are parallel to the same line, then they are parallel to each other.
CLIP (congruent implies perpendicular)
Congruent, linear pair, implies perpendicular
If two lines intersect to form a linear pair of congruent angles, then they are perpendicular.
PITAC (perpendicular => 2 angles are complementary)
Perpendicular implies two angles are complementary
If two sides of adjacent angles are perpendicular, then angles are complementary.
PIFRA (perpendicular => 4 right angles)
Perpendicular implies 4 right angles
If two lines are perpendicular, then they intersect to form 4 right angles
*** PPP (perpendicular trans. theorem)
Parallel, perpendicular, parallel
If a transversal is perpendicular to one of the two parallel lines, then it is perpendicular to the other.
PPPL (converse PPP)
All ways parallel
In a plane, if two lines are perpendicular to the same line, then they are parallel to each other.
Use Theorems If…
Two parallel lines are given and the question asks stuff about them.
Use Converse Theorems If…
Angles are given and have to prove they’re parallel.
Congruent Supplement/Complement Thm. (CST)
If two angles are supplemental/complemental to the same angle then they are congruent.
How to Solve a system of equations problem
Make sure 1 of the variables cancels out when you subtract them