What is the formula for the circumference of a circle?
Circumference, Arc Measure, and Arc Length

Flashcard
•
Mathematics
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
C = πd or C = 2πr, where d is the diameter and r is the radius.
2.
FLASHCARD QUESTION
Front
If the radius of a circle is 7 in, what is the circumference?
Back
C = 2π(7) = 14π in.
3.
FLASHCARD QUESTION
Front
How many degrees are in a semicircle?
Back
180 degrees.
4.
FLASHCARD QUESTION
Front
What is a minor arc?
Back
An arc that is smaller than a semicircle.
5.
FLASHCARD QUESTION
Front
What is a major arc?
Back
An arc that is larger than a semicircle.
6.
FLASHCARD QUESTION
Front
What is the measure of a full circle in degrees?
Back
360 degrees.
7.
FLASHCARD QUESTION
Front
If an arc measures 120 degrees, what fraction of the circle does it represent?
Back
120/360 = 1/3 of the circle.
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