Lesson objective: Apply the formulas for finding the area of triangles, parallelograms, and trapezoids.

This lesson provides an opportunity for students to apply their knowledge and understanding of finding the area of two-dimensional figures to a real-life situation. Students are asked to determine the amount of grass needed for a park by subtracting the various areas where each equipment piece will be situated with soft landing zones.

Key Concept students will use:

Skills students will use:

- finding area of a rectangle (Grade 4, Unit 2).
- decomposing figures.
- the area formulas for two-dimensional figures.

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they determine the relationship between the information given and what they need to find, calculate the area of each figure, and determine the amount of grass needed.

**Key vocabulary: **

- area
- parallelogram
- trapezoid
- triangle