https://www.khanacademy.org/math/cc-third-grade-math-essentials/x4d7f0c483aed92ac:quadrilaterals 2026-07-01T18:00:50.132844928Z Geometry With four sides and four angles, quadrilaterals might seem pretty straight-forward. But there's a lot more to these shapes than you might think! In this unit, you'll learn all about these four-sided shapes and hone your skills at identifying, analyzing and classifying them. Everything around us has a measurable area from the floor we walk on to the walls of our rooms. In this unit, we'll be exploring area! We'll also learn some handy ways to figure out just how much space a shape covers--from counting squares, to multiplying, to breaking shapes down into smaller pieces. This unit will also walk you through everything you need to know about measuring the distance around shapes and finding out how big (or small) they really are. Let's get measuring! unit