Circles and Composite Figures Playground
Grade 7 Mathematics Exploring circumference, area, and composite shapes Interactive learning adventure
What is π (Pi)?
The ratio of circumference to diameter π ≈ 3.14159... Always the same for ANY circle! Essential for circle calculations
Circle Scavenger Hunt
Find circular objects in the classroom Measure diameter or radius Calculate circumference: C = 2πr or C = πd Calculate area: A = πr² Record your findings!
Circle Formulas Review
{"left":"Circumference = 2πr\nCircumference = πd\nArea = πr²","right":"Remember: r = radius, d = diameter\nπ ≈ 3.14 or use π button on calculator\nAlways include units in your answer!"}
What are Composite Figures?
Shapes made from combining simpler shapes Examples: rectangles + semicircles Break apart to find total area Add areas of individual shapes together
Design Your Dream Playground
Use cut-out shapes to create a playground Include circles, semicircles, rectangles, triangles Calculate the total area of your design Label each shape with its area Be creative and have fun!
Peer Teaching Challenge
Explain your playground design to another pair Share your calculation strategy What shapes did you use and why? How did you find the total area? Ask questions to deepen understanding
Key Takeaways
π is the constant ratio of circumference to diameter Break composite figures into simpler shapes Calculate area of each part, then add together Real-world applications: sports fields, gardens, architecture Practice makes perfect!