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

Flashcard
•
Mathematics
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
C = 2πr or C = πd, where r is the radius and d is the diameter.
2.
FLASHCARD QUESTION
Front
What is the formula for the area of a circle?
Back
A = πr², where r is the radius.
3.
FLASHCARD QUESTION
Front
If a circle has a radius of 7 cm, what is its circumference?
Back
C = 2π(7) ≈ 43.98 cm.
4.
FLASHCARD QUESTION
Front
If a circle has a diameter of 10 cm, what is its area?
Back
A = π(5)² ≈ 78.54 cm².
5.
FLASHCARD QUESTION
Front
What is the relationship between diameter and radius?
Back
The diameter is twice the radius (d = 2r).
6.
FLASHCARD QUESTION
Front
How do you convert diameter to radius?
Back
Divide the diameter by 2 (r = d/2).
7.
FLASHCARD QUESTION
Front
What is the circumference of a circle with a radius of 13.5 mm?
Back
C ≈ 84.78 mm.
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