What is the formula for the area of a circle?
Circles Review

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•
Mathematics
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Area = πr², where r is the radius of the circle.
2.
FLASHCARD QUESTION
Front
What is the relationship between the radius and diameter of a circle?
Back
The diameter is twice the length of the radius (d = 2r).
3.
FLASHCARD QUESTION
Front
What is the circumference of a circle?
Back
Circumference = 2πr, where r is the radius.
4.
FLASHCARD QUESTION
Front
How do you find the length of an arc in a circle?
Back
Arc length = (θ/360) × 2πr, where θ is the central angle in degrees.
5.
FLASHCARD QUESTION
Front
What is a chord in a circle?
Back
A chord is a line segment whose endpoints lie on the circle.
6.
FLASHCARD QUESTION
Front
What is the relationship between the central angle and the inscribed angle that subtends the same arc?
Back
The central angle is twice the measure of the inscribed angle.
7.
FLASHCARD QUESTION
Front
What is the measure of a semicircle?
Back
A semicircle measures 180°.
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