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Circle Area and Circumference
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Circle Area and Circumference
📐 Part 1: Circle Formulas and Calculations
1. What is the formula for the area of a circle?
A = πr
A = πr²
A = 2πr
A = πd
2. What is the formula for the circumference of a circle?
C = πr²
C = 2πr
C = πr
C = 4πr
3. Find the circumference of a circle with radius = 5 inches. Use π = 3.14.
4. Find the area of a circle with radius = 6 feet. Use π = 3.14.
5. A circle has a diameter of 12 inches. What is its circumference? Use π = 3.14.
🧮 Part 2: Problem Solving
6. A pizza has a radius of 8 inches. What is the area of the pizza? Use π = 3.14.
7. A circular garden has a circumference of 31.4 feet. What is the radius of the garden? Use π = 3.14.
8. Which circle has the larger area?
Circle A: radius = 4 inches
Circle B: diameter = 6 inches
Circle A
Circle B
They are equal
Show your work:
💭 Part 3: Critical Thinking
9. If you double the radius of a circle, what happens to its area?
The area doubles
The area triples
The area becomes 4 times larger
The area stays the same
10. Explain in your own words the difference between area and circumference of a circle.
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