Common Core · Grade 3
3.MD.D.8
Grade 3 — Solve problems involving the perimeter of polygons, including finding an unknown side length.
The skill that covers it
What a student should be able to do
- Find the perimeter and area of rectangles and triangles.
- Use the area formulas for parallelograms and trapezoids.
- Decompose a composite figure to find its area.
- Work backwards from an area to a missing side length.