https://www.khanacademy.org/math/cc-sixth-grade-math-essentials/x2fbfb4d617cb5ebb:coordinate-plane-geometry 2026-07-01T15:45:19.26393441Z Geometry & the coordinate plane A coordinate plane is a two-dimensional grid, typically with an x-axis and a y-axis, that allows us to visually represent and locate points in space. Just like on the number line, the coordinate plane can show positive and negative values. Just look for their position to the left, right, above, or below the origin. You'll also work with two-dimensional figures, which have area and perimeter to describe the measurements of their interiors and exteriors. You'll learn how to find the area of parallelograms and triangles. With 3D figures, we use surface area for the same ideas. For surface area, we'll add the areas of each outside face. unit