whats q poem that has 10 syllables per line

"Pentameter" if the poet is using iambs or trochees (2-syllable poetic "feet").

Could be others, depending on how many syllables per poetic foot.

http://www.uncg.edu/~htkirbys/meters.htm

http://www2.one-eyed-alien.net/~ayelton/Writing/meter.html

A poem that has 10 syllables per line is called a decasyllabic poem. One popular form of decasyllabic poetry is the "sonnet." A sonnet consists of 14 lines, typically written in iambic pentameter, with each line containing 10 syllables. Iambic pentameter is a metrical pattern in which each line has five pairs of unstressed and stressed syllables. This creates a rhythmic flow in the poem. Examples of famous sonnets include Shakespeare's "Sonnet 18" and "Sonnet 130." These poems adhere to the structure of 10 syllables per line while conveying deep and thoughtful messages.