Circle Flashcard
Flashcard
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
Back
Circumference = π × diameter (C = πd) or Circumference = 2 × π × radius (C = 2πr)
2.
FLASHCARD QUESTION
Front
What is the formula for the area of a circle?
Back
Area = π × radius² (A = πr²)
3.
FLASHCARD QUESTION
Front
How do you find the radius if you know the diameter?
Back
Radius = Diameter / 2
4.
FLASHCARD QUESTION
Front
What is the diameter of a circle?
Back
The diameter is the distance across the circle through its center, equal to twice the radius.
5.
FLASHCARD QUESTION
Front
What is π (pi)?
Back
π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.
6.
FLASHCARD QUESTION
Front
If the radius of a circle is 7 cm, what is the circumference?
Back
Circumference = 2 × π × 7 cm ≈ 43.98 cm
7.
FLASHCARD QUESTION
Front
If the radius of a circle is 5 in, what is the area?
Back
Area = π × (5 in)² ≈ 78.54 in²
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