https://es-cl.khanacademy.org/math/cc-third-grade-math/3rd-perimeter 2025-11-20T17:52:28.558772074Z Perimeter Get ready to draw the line--the perimeter line, that is! This unit will walk you through everything you need to know about measuring the distance around shapes and finding out how big (or small) they really are. Who knew math could be so much fun? unit