What is the formula for arc length in a circle?
Arc Length and Sector Area

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•
Mathematics
•
9th - 10th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Arc Length = (θ/360) * 2πr, where θ is the angle in degrees and r is the radius.
2.
FLASHCARD QUESTION
Front
How do you calculate the area of a sector in a circle?
Back
Area of Sector = (θ/360) * πr², where θ is the angle in degrees and r is the radius.
3.
FLASHCARD QUESTION
Front
What is the relationship between the diameter and radius of a circle?
Back
The radius is half of the diameter. r = d/2.
4.
FLASHCARD QUESTION
Front
If a circle has a radius of 10 inches, what is its circumference?
Back
Circumference = 2πr = 2π(10) = 20π inches.
5.
FLASHCARD QUESTION
Front
What is the measure of a full circle in degrees?
Back
A full circle measures 360 degrees.
6.
FLASHCARD QUESTION
Front
How many degrees are in a right angle?
Back
A right angle measures 90 degrees.
7.
FLASHCARD QUESTION
Front
What is the formula to find the radius if the area of a sector is known?
Back
Radius can be found using r = √(Area * (360/πθ)).
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