Polygons on the coordinate Plane (Perimeter)

Main idea

We can find the perimeter of polygons by using their coordinates on the coordinate plane

Coordinate plane

Has an x axis left right and y axis up down

Coordinates x y

X moves left or right Y moves up or down

Perimeter

Add up all side lengths

Example

Points A 5 2 B 5 4 C 7 2 D 7 4 shape is a rectangle length 7 - 5 = 2 width 4 - 2 = 2 perimeter 2 + 2 + 2 + 2 = 8 units

Quick steps

Plot points identify shape subtract coordinates to find side lengths same y subtract x same x subtract y add all sides together

Memory tip

Think of perimeter like walking the whole path around the shape

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Polygons on the Coordinate Plane 9 30 25