Polygons on the Coordinate Plane - (Area)

Main idea

We can find the area or space inside polygons by using coordinates and formulas

Polygon

A 2D shape with at least 3 straight sides

Coordinates x y

Show where a point is X moves left or right Y moves up or down

Square or rectangle formula

A = length × width

Parallelogram formula

A = base × height

Triangle formula

A = ½ × base × height

Trapezoid formula

A = ½ × (b1 + b2) × height

Example

Shape is a rectangle length = 3 width = 2 area = 3 × 2 = 6 square units

Quick steps

Plot points connect the shape find side lengths count or subtract coordinates use the correct formula multiply to find area

Memory tip

Think of area like how many little squares fit inside the shape

TITLE

Polygons on the Coordinate Plane Area 9 30 25