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

Flashcard
•
Mathematics
•
7th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
Back
The circumference (C) of a circle is given by the formula: C = 2πr, where r is the radius.
2.
FLASHCARD QUESTION
Front
What is the formula for the area of a circle?
Back
The area (A) of a circle is given by the formula: A = πr², where r is the radius.
3.
FLASHCARD QUESTION
Front
If the radius of a circle is doubled, how does the area change?
Back
If the radius is doubled, the area increases by a factor of four (4).
4.
FLASHCARD QUESTION
Front
What is the relationship between diameter and radius?
Back
The diameter (d) of a circle is twice the radius (r): d = 2r.
5.
FLASHCARD QUESTION
Front
How do you find the radius if you know the diameter?
Back
To find the radius, divide the diameter by 2: r = d/2.
6.
FLASHCARD QUESTION
Front
What is the circumference of a circle with a radius of 5 cm?
Back
C = 2π(5) = 10π cm.
7.
FLASHCARD QUESTION
Front
What is the area of a circle with a radius of 3 inches?
Back
A = π(3)² = 9π in².
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