Chapter 1
An angle that is exactly 90 degrees
Right angle
The “if” part of a conditional statement, normally written with the symbol p
Hypothesis
Lines that have the same slope, go in the same direction, and never intersect
Parallel lines
What does SAS stand for?
Side-Angle-Side
An angle that is less than 90 degrees
Acute angle
The "then" part of a conditional statement, normally written with the symbol q
Conclusion
Lines that have negative reciprocal slopes and intersect at a 90 degree angle
Perpendicular lines
What does HL stand for?
Hypotenuse-Leg
An angle that is greater than 90 degrees
Obtuse angle
A statement that has a hypothesis and conclusion, written as p -> q
Conditional statement
A line that intersects two or more lines
Transversal
All three sides of a triangle are congruent
Equilateral triangle
Opposite angles when two lines intersect; these angles are congruent
Vertical angles
A statement that uses "if and only if", written as
p <-> q
Biconditional statement
Two angles in the same position and same side of a transversal; these angles are congruent
Corresponding angles
Two sides of a triangle are congruent
Isosceles triangle
On the same line
Collinear
"Not" or the opposite, normally written with the symbol ~
Negation
Two angles on the inside and same side of a transversal; these angles are supplementary
Consecutive interior angles
None of the sides of a triangle are congruent
Scalene triangle