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

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•
Mathematics
•
6th - 8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A = πr², where A is the area and r is the radius.
2.
FLASHCARD QUESTION
Front
If a circle has a diameter of 10 feet, what is its radius?
Back
The radius is 5 feet, since the radius is half of the diameter.
3.
FLASHCARD QUESTION
Front
What is the relationship between the diameter and the radius of a circle?
Back
The diameter is twice the radius (d = 2r).
4.
FLASHCARD QUESTION
Front
How do you calculate the circumference of a circle?
Back
C = πd or C = 2πr, where C is the circumference, d is the diameter, and r is the radius.
5.
FLASHCARD QUESTION
Front
What is the area of a circle with a radius of 3 cm?
Back
A = π(3)² = 28.26 cm².
6.
FLASHCARD QUESTION
Front
What is the area of a semicircle with a radius of 4 cm?
Back
A = (1/2)π(4)² = 25.13 cm².
7.
FLASHCARD QUESTION
Front
If the circumference of a circle is 31.4 cm, what is its radius?
Back
r = C/(2π) = 31.4/(2π) = 5 cm.
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