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a statement that contains the phrase "if and only if" the symbol for "if and only if" is ↔
line perpendicular to a plane
a line that intersects the plane in in a point and is perpendicular to every line in the plane that intersects it
a type of proof written as numbered statements and reasons that show the logical order of an argument
two lines that intersect to form a right angle. the smybol for "is perpendicular to" is ⊥
an argument based on deductive reasoning, which uses facts, definitions, and accepted properties in a logical order
the statement formed when you negate the hypothesis and conclusion of the converse of a conditional statement
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