Area of Irregular Polygons on the Plane

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

Split irregular polygons on a coordinate grid into rectangles and triangles and add their areas. The directions on the page read: Draw lines on the grid to split each polygon into rectangles and triangles. Each grid square is 1 unit. Find the area of each part in the box, then add to get the total. 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.