What is the formula for the circumference of a circle?
Circumference and Area of a Circle

Flashcard
•
Mathematics
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
C = π·d, where C is the circumference and d is the diameter.
2.
FLASHCARD QUESTION
Front
What is the relationship between the diameter and radius of a circle?
Back
The radius is half of the diameter. (r = d/2)
3.
FLASHCARD QUESTION
Front
If the radius of a circle is 7 cm, what is the diameter?
Back
The diameter is 14 cm.
4.
FLASHCARD QUESTION
Front
What is the area of a circle with a radius of 4 cm?
Back
Area = π·r² = π·(4)² = 16π cm² (approximately 50.24 cm²).
5.
FLASHCARD QUESTION
Front
What does the symbol π (pi) represent?
Back
π is a constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.
6.
FLASHCARD QUESTION
Front
How do you calculate the area of a circle?
Back
Area = π·r², where r is the radius.
7.
FLASHCARD QUESTION
Front
What is the circumference of a circle with a diameter of 10 m?
Back
Circumference = π·d = π·10 m (approximately 31.4 m).
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