Circles: Area and Circumference Practice
Flashcard
•
Mathematics
•
8th Grade
•
Practice Problem
•
Easy
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
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 circumference of a circle is 31.4 cm, what is the radius?
Back
The radius is 5 cm.
4.
FLASHCARD QUESTION
Front
What is the value of π (pi) approximately?
Back
π is approximately 3.14.
5.
FLASHCARD QUESTION
Front
How do you find the radius from the circumference?
Back
To find the radius (r) from the circumference (C), use the formula: r = C / (2π).
6.
FLASHCARD QUESTION
Front
If the area of a circle is 314 cm², what is the radius?
Back
The radius is 10 cm.
7.
FLASHCARD QUESTION
Front
What is the relationship between diameter and radius?
Back
The diameter (d) of a circle is twice the radius: d = 2r.
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