Yes they typically have five syllables.
A couplet.
rhyming couplet
Provided that the metre is the same, the lines are referred to as a 'couplet'.
A hyphen.
It has no lines of symetry at all.
Two lines are in a couplet.two
No, a couplet is a pair of rhymed lines in a poem or verse. A metrical foot is a unit of stressed and unstressed syllables used in metered poetry.
A heroic couplet is a pair of rhymed lines in iambic pentameter. Each line typically consists of ten syllables and ends with a rhyming pair that gives the couplet unity and completeness. This form is often associated with epic and narrative poetry.
...a rhyming couplet. If the first syllable of each line is stressed, it's a 'heroic' rhyming couplet.
A couplet is a pair of lines in a poem which rhyme. In an English sonnet, only (the last two lines) form a couplet.
A stanza containging two lines
A couplet is two successive lines of verse which rhyme.
Traditionally, the three lines in a haiku have 5, 7 and 5 syllables respectively.
three quatrains and a couplet
A couplet is a type of poetic device. It is a stanza of only two lines that usually rhyme and share the same length. Ultimately, the two lines should form a complete thought. Shakespeare's sonnets are a good example of a couplet. An example of a couplet comes from Shakespeare's 116 sonnet: "...Love alters not with his brief hours and weeks, But bears it out even to the edge of doom. If this be error and upon me proved, I never write, nor no man ever loved." In this example, the last two lines make up the couplet.
A couplet in poetry is a pair of consecutive lines that rhyme with each other. Typically, a couplet presents a complete thought or idea within those two lines. Couplet is a common form used in various poetic traditions.
A stanza of two lines is called a couplet.