Circumference and Area of Circles

Flashcard
•
Mathematics
•
7th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
Back
Circumference = 2πr, where r is the radius.
2.
FLASHCARD QUESTION
Front
What is the formula for the area of a circle?
Back
Area = πr², where r is the radius.
3.
FLASHCARD QUESTION
Front
If the radius of a circle is 4 units, what is the circumference?
Back
Circumference = 2π(4) = 8π units.
4.
FLASHCARD QUESTION
Front
If the radius of a circle is 4 units, what is the area?
Back
Area = π(4)² = 16π square units.
5.
FLASHCARD QUESTION
Front
What is a sector of a circle?
Back
A sector is a portion of a circle enclosed by two radii and the arc between them.
6.
FLASHCARD QUESTION
Front
How do you find the area of a sector?
Back
Area of a sector = (θ/360) × πr², where θ is the angle in degrees.
7.
FLASHCARD QUESTION
Front
What is an arc in a circle?
Back
An arc is a part of the circumference of a circle.
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