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Grade 4 Math · World 9: Angle and Shape Studio · Level 94
Area and Perimeter of Composite Rectangles
Find the area and perimeter of shapes made of rectangles.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 94
- This floor is shaped like an L. It's made of two rectangles, split by the dashed line. Every side's length is given.
- Area: the purple part is 6 × 8 = 48, and the green part is 6 × 4 = 24. Together, 48 + 24 = 72 square meters.
- Perimeter: add every side going around. 6 + 4 + 6 + 4 + 12 + 8 = 40 meters.
Georgia's K-12 Mathematics Standards:
- 4.GSR.8.3 — Solve problems involving area and perimeter of composite rectangles involving whole numbers with known side lengths.