What is the formula to calculate the circumference of a circle?
Circumference Practice

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•
Mathematics
•
7th - 9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Circumference = π × diameter or Circumference = 2 × π × radius.
2.
FLASHCARD QUESTION
Front
If the diameter of a circle is 14 cm, what is the radius?
Back
Radius = diameter / 2 = 14 cm / 2 = 7 cm.
3.
FLASHCARD QUESTION
Front
What is the value of π (pi) approximately?
Back
π (pi) is approximately 3.14.
4.
FLASHCARD QUESTION
Front
How do you find the circumference of a circle with a radius of 12.5 mm?
Back
Circumference = 2 × π × radius = 2 × 3.14 × 12.5 mm = 78.5 mm.
5.
FLASHCARD QUESTION
Front
What is the circumference of a circle with a diameter of 10 cm?
Back
Circumference = π × diameter = 3.14 × 10 cm = 31.4 cm.
6.
FLASHCARD QUESTION
Front
What is the relationship between diameter and radius?
Back
The diameter is twice the radius (Diameter = 2 × Radius).
7.
FLASHCARD QUESTION
Front
If a circle has a circumference of 31.4 cm, what is its diameter?
Back
Diameter = Circumference / π = 31.4 cm / 3.14 = 10 cm.
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