A pair of rhymed iambic pentametre lines is a

Explanation

Heroic Couplet: A heroic couplet is a poetic form consisting of two rhymed lines written in iambic pentameter. Iambic pentameter is a meter in poetry where each line consists of five iambs, which are metrical feet with one unstressed syllable followed by one stressed syllable. In the context of a heroic couplet, each line has ten syllables (pentameter) and follows the pattern of iambs. The rhyme scheme is usually AABB, meaning that the first and second lines rhyme with each other. So, when you encounter a poetic structure with two lines of rhymed iambic pentameter, you can identify it as a heroic couplet.