Area and Sectors of a Circle

Flashcard
•
Mathematics
•
9th - 12th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the formula for the area of a circle?
Back
A = πr², where A is the area and r is the radius.
2.
FLASHCARD QUESTION
Front
How do you find the area of a sector of a circle?
Back
Area of sector = (θ/360) × πr², where θ is the central angle in degrees.
3.
FLASHCARD QUESTION
Front
What is the relationship between the radius and the area of a circle?
Back
The area increases with the square of the radius; doubling the radius increases the area by a factor of four.
4.
FLASHCARD QUESTION
Front
If the radius of a circle is 7 inches, what is its area?
Back
A = π(7)² = 49π square inches.
5.
FLASHCARD QUESTION
Front
What is a segment of a circle?
Back
A segment is the area of a circle 'cut off' by a chord.
6.
FLASHCARD QUESTION
Front
How do you calculate the area of a segment?
Back
Area of segment = Area of sector - Area of triangle formed by the radius and chord.
7.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
Back
C = 2πr, where C is the circumference and r is the radius.
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