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

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Mathematics
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Area = πr², where r is the radius of the circle.
2.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
Back
Circumference = πd or Circumference = 2πr, where d is the diameter and r is the radius.
3.
FLASHCARD QUESTION
Front
If a circle has a radius of 7 cm, what is its area?
Back
154 cm² (Area = π(7)² = 154 cm²).
4.
FLASHCARD QUESTION
Front
If a circle has a diameter of 10 m, what is its circumference?
Back
31.4 m (Circumference = πd = π(10) = 31.4 m).
5.
FLASHCARD QUESTION
Front
What is the value of π (pi) approximately?
Back
π is approximately 3.14.
6.
FLASHCARD QUESTION
Front
How do you find the radius if you know the circumference?
Back
Radius = Circumference / (2π).
7.
FLASHCARD QUESTION
Front
What is the area of a circle with a diameter of 12 inches?
Back
113.1 in² (Area = π(6)² = 113.1 in²).
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