What is the formula for the area of a circle?
Area of Crircles

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Mathematics
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The area of a circle is calculated using the formula A = πr², where A is the area and r is the radius.
2.
FLASHCARD QUESTION
Front
If the radius of a circle is 5 cm, what is its area?
Back
A = π(5 cm)² = 25π cm² ≈ 78.5 cm².
3.
FLASHCARD QUESTION
Front
What does π (pi) represent in the context of circles?
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 find the radius if you know the area of the circle?
Back
To find the radius, rearrange the area formula: r = √(A/π).
5.
FLASHCARD QUESTION
Front
What is the area of a circle with a diameter of 10 inches?
Back
First, find the radius: r = diameter/2 = 5 inches. Then, A = π(5 inches)² = 25π inches² ≈ 78.5 inches².
6.
FLASHCARD QUESTION
Front
What is the area of a circle with a radius of 3 m?
Back
A = π(3 m)² = 9π m² ≈ 28.3 m².
7.
FLASHCARD QUESTION
Front
If the area of a circle is 50.3 cm², what is the radius?
Back
Using the formula r = √(A/π), r = √(50.3/π) ≈ 4.0 cm.
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