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

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•
Mathematics
•
7th 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
What is the formula for the circumference of a circle?
Back
C = 2πr or C = πd, where C is the circumference, r is the radius, and d is the diameter.
3.
FLASHCARD QUESTION
Front
What is the radius of a circle?
Back
The radius is a line segment from the center of the circle to any point on its circumference.
4.
FLASHCARD QUESTION
Front
What is the diameter of a circle?
Back
The diameter is a line segment that passes through the center of the circle and connects two points on its circumference. It is twice the length of the radius.
5.
FLASHCARD QUESTION
Front
If the radius of a circle is 7 cm, what is the area?
Back
A = π(7)² = 49π cm² (approximately 153.94 cm²).
6.
FLASHCARD QUESTION
Front
If the diameter of a circle is 20 cm, what is the radius?
Back
Radius = diameter/2 = 20 cm / 2 = 10 cm.
7.
FLASHCARD QUESTION
Front
What is the relationship between diameter and radius?
Back
The diameter is twice the radius (d = 2r).
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