Circle Area and Circumference
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Circle Area and Circumference
📐 Do Now: Circle Word Problems
Directions: Solve each problem. Show your work and round to the nearest tenth when necessary. Use π = 3.14
Answer: _________________ square inches
Answer: _________________ feet
Answer: _________________ square meters
📝 Formulas Reference
Area of a Circle: A = πr²
Circumference of a Circle: C = πd or C = 2πr
Remember: radius = diameter ÷ 2, diameter = radius × 2
Circle Area and Circumference - Answer Key
🔑 Answer Key
Solution:
A = πr²
A = 3.14 × 8²
A = 3.14 × 64
A = 200.96 square inches
Answer: 201.0 square inches
Solution:
C = πd
C = 3.14 × 12
C = 37.68 feet
Answer: 37.7 feet
Solution:
First, find the radius using C = 2πr
62.8 = 2 × 3.14 × r
62.8 = 6.28r
r = 62.8 ÷ 6.28 = 10 meters
Then find the area: A = πr²
A = 3.14 × 10²
A = 3.14 × 100 = 314 square meters
Answer: 314.0 square meters
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