What is the formula for calculating the circumference of a circle?
Circumference

Flashcard
•
Mathematics
•
6th - 7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
C = π·d or C = 2·π·r, where C is the circumference, d is the diameter, and r is the radius.
2.
FLASHCARD QUESTION
Front
If the diameter of a circle is 10 inches, what is the radius?
Back
5 inches (Radius is half of the diameter).
3.
FLASHCARD QUESTION
Front
What does the symbol π (pi) represent in geometry?
Back
π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.
4.
FLASHCARD QUESTION
Front
How do you convert diameter to radius?
Back
To convert diameter to radius, divide the diameter by 2.
5.
FLASHCARD QUESTION
Front
What is the circumference of a circle with a radius of 7 cm? Use 3.14 for pi.
Back
43.96 cm (C = 2·π·r = 2·3.14·7).
6.
FLASHCARD QUESTION
Front
What is the relationship between diameter and circumference?
Back
The circumference is directly proportional to the diameter; as the diameter increases, the circumference increases.
7.
FLASHCARD QUESTION
Front
If a circle has a circumference of 31.4 cm, what is its diameter? Use 3.14 for pi.
Back
10 cm (d = C/π = 31.4/3.14).
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