Perimeter by Tracing Every Side
The perimeter of a composite or overlapped figure is found by following its boundary and summing each side, using rectangle/square side equalities and overlap relations to recover unknown segments. Learners trace joined rectangles, ribbons around boxes, and overlapped polygons, later with fractional and decimal side lengths. The discipline is accounting for every boundary segment exactly once.
grade 2–4 GMDNBTNFOA Draw a DiagramIdentify Subproblems
Progression (11)
2-2 1. Ribbon around a box: four equal parts 2.MD.B.53.MD.D.8
3-1 2. Find a side from equal perimeters 3.MD.D.84.MD.A.33.OA.A.4
3-1 3. Side lengths from overlapping rectangles 3.MD.D.84.MD.A.33.OA.D.8
3-1 4. Perimeter plus tiles needed to build it 3.MD.D.84.MD.A.33.OA.A.3
3-1 5. Perimeter by tracing every side 3.MD.D.84.MD.A.3
3-1 6. Find perimeter path length by multiplication 3.MD.D.83.OA.A.3
3-2 7. Perimeter as side length times side count 3.MD.D.83.OA.C.7
4-2 8. Find a missing side, then sum sides as fractions 4.NF.B.34.MD.A.3
4-2 9. Perimeter as decimal side sums minus overlaps 5.NBT.B.74.MD.A.3
4-2 10. Perimeter of overlapped squares and rectangles 4.MD.A.34.G.A.2
4-2 11. Distance between parallel sides equals the side length 4.G.A.14.MD.A.3