Circle Area and Circumference
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Circle Area and Circumference
📚 Part 1: Formula Knowledge
🧮 Part 2: Calculations
🎯 Part 3: Word Problems
Circle Area and Circumference - Answer Key
📚 Part 1: Formula Knowledge - Answers
Answer: A = πr²
Answer: C = 2πr
Answer: 10 inches (diameter = 2 × radius)
🧮 Part 2: Calculations - Answers
Answer: 113.04 square feet
Work: A = πr² = 3.14 × 6² = 3.14 × 36 = 113.04 ft²
Answer: 43.96 inches
Work: C = πd = 3.14 × 14 = 43.96 inches
Answer: 200.96 square feet
Work: A = πr² = 3.14 × 8² = 3.14 × 64 = 200.96 ft²
Answer: 81.64 inches
Work: C = πd = 3.14 × 26 = 81.64 inches
🎯 Part 3: Word Problems - Answers
Answer: 254.34 square inches
Work: A = πr² = 3.14 × 9² = 3.14 × 81 = 254.34 in²
Answer: 10 feet
Work: C = 2πr, so 62.8 = 2 × 3.14 × r, so 62.8 = 6.28r, so r = 10 feet
Answer: The square has a greater area
Square area: 10² = 100 square inches
Circle area: π × 6² = 3.14 × 36 = 113.04 square inches
Correction: The circle actually has the greater area (113.04 > 100)
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