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# geometry ch 2

## Terms

undefined, object
copy deck
A type of logical statement that has two parts, a hypothesis and conplusion
conditional statement
a form of a conditional statement using "if" and "then" the if is the hypothesis and then is the conclusion.
If-then statement
The statement formed by switching the hypothesis and conclusion of a conditional statement.
converse
The negative of a statement

symbol: ~
negation
statement formed when negating the hypothesis and conclusion of a conditional statement
inverse
statement formed when you negate the hypothesis and conclusion of the converse of a conditional statement.
contropositive
two statements that are both true or both false.
equivalent statements
two lines that intersect to form a right angle

symbol:(upside down T)
perpendicular lines
a line that intersects the plane in a point and is perpendicular to ever line in the plane that it intersects it
line perpendcular to a plane
a statement that that contains the phrase "if and only if"

symbol: â€¹â€•â€º
biconditional statement
an argument based on deductive reasoning, which use facts, definitions, and accepted properties in a logical order.
logical argument
if pâ€•â€ºq is a true conditional statement and p is true, then q is true
Law of Detachment
if pâ€•â€ºq and qâ€•â€ºr are true conditional statements, then pâ€•â€ºr is true
Law of Syllogism
a true statement that follows as a result of other true statements.
theorum
a type of proof written as numbered statements and reasons that show the logical order of an argument.
two-column proof

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