Two lines on a page can cross, meet at a square corner or never meet at all. This 3rd grade parallel and perpendicular lines worksheet turns those three cases into six short tasks. Each task shows one pair of coloured lines with arrows at both ends, and it then asks one question, such as “Check whether these lines are perpendicular.” Your child answers yes or no and writes a short reason, which is the real heart of the page. Two tasks ask about intersecting lines, two about perpendicular lines and two about parallel lines. The page sits on light grid paper, so the angles are easy to see. Page two is the answer key, with a full sentence under each pair.