In this lesson, students will explore the area of irregular shapes to find multiple different
methods for calculating area.
Upon completion of this lesson, students will:
Shape Explorer applet, draw a rectangular shape for the students to see. Activate prior knowledge using these
Let the students know what they will be doing and learning today. Say something like this:
Use the following chart as a guideline:
Break the students into groups of three and give them the following instructions:
For each shape, give the students a set amount of time to develop methods. Then have the each
group share their methods to see how many methods the whole class used.
Lead the class in a discussion about how they found the area for a given shape. Ask the students
how the developed new methods of finding the area each time.
Students who have mastered the skills necessary to find the area of irregular shapes may be ready
to learn about finding
triangle area or
surface area and volume.