{{ toc.signature }}
{{ toc.name }}
{{ stepNode.name }}
Proceed to next lesson
An error ocurred, try again later!
Chapter {{ article.chapter.number }}
{{ article.number }}.

# {{ article.displayTitle }}

{{ article.introSlideInfo.summary }}
{{ 'ml-btn-show-less' | message }} {{ 'ml-btn-show-more' | message }} expand_more
##### {{ 'ml-heading-abilities-covered' | message }}
{{ ability.description }}

#### {{ 'ml-heading-lesson-settings' | message }}

{{ 'ml-lesson-show-solutions' | message }}
{{ 'ml-lesson-show-hints' | message }}
 {{ 'ml-lesson-number-slides' | message : article.introSlideInfo.bblockCount}} {{ 'ml-lesson-number-exercises' | message : article.introSlideInfo.exerciseCount}} {{ 'ml-lesson-time-estimation' | message }}

# Biconditional Statement

A biconditional statement is a statement that combines a conditional statement and its converse. A biconditional statement contains the phrase if and only if.
A definition can be written as a biconditional statement. Consider the definition of complementary angles. Two angles whose measures have a sum of are called complementary angles. The hypothesis and conclusion can be written as follows.
After identifying the parts, the definition can be written as a single biconditional statement.
Statement
Conditional
If
Converse
If then
Biconditional
if and only if

A biconditional statement is true if and only if the conditional and its converse have the same truth value. This can be explained using the truth table for a biconditional.

Biconditional Statement
T T T
T F F
F T F
F F T