natural numbers - Whole positive counting numbers. Symbol ℕ., integers - Collection of whole positive and negative numbers, including zero. Symbol ℤ, coordinate plane - Cartesian plane or x-y plane used to plot (x,y) pairs on a two-line graph., origin - The point (0,0) where the two number lines on a Cartesian (coordinate) plane meet., area - The number of unit squares that can be contained within a flat or plane figure (shape)., perimeter - Found by adding together the lengths of all sides of a shape., axis of symmetry - The line that divides a figure into two mirror image halves., axial symmetry - Finding the reflection of an object in a line.,

Number, Coordinate Plane and Symmetry

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