Polygon Area With Decimal Coordinates

Use them after students are comfortable plotting points in all four quadrants. The quilt block task works well as a longer assignment.

Plot four points with decimal coordinates on a half-unit grid and find the area of the polygon. The directions on the page read: Plot the points in order, joining the last point to A. Each grid square is 0.5 unit wide and tall. Find the area in square units and show your work in the box. An answer key is included.

Yes, both. We made it for 7th grade geometry, and it works the same at home or at school. At home, a student can work through it alone and then go over it with you, which shows quickly what is solid and what needs another look. In class it works as independent practice, homework or a warm-up, and you can print one copy or a full set.

Read the coordinates of the vertices, use them to find side lengths, then apply the area formula. For irregular polygons, split the figure into rectangles and triangles and add the areas.

When two points share an x or y value, subtract the other coordinates and use the distance between them. With negative values, count the units across zero.

In Design a Quilt Block on the Coordinate Plane, students plot shapes on a grid where one unit is 1 inch. It has two pages and several parts.

Yes. All 4 worksheets in this group have answer keys.