What is a circle?
Review of Circles

Flashcard
•
Mathematics
•
9th - 10th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
Back
A circle is a set of points in a plane that are equidistant from a fixed point called the center.
2.
FLASHCARD QUESTION
Front
What is the radius of a circle?
Back
The radius is the distance from the center of the circle to any point on its circumference.
3.
FLASHCARD QUESTION
Front
What is the diameter of a circle?
Back
The diameter is twice the length of the radius and is the longest distance across the circle.
4.
FLASHCARD QUESTION
Front
What is a tangent to a circle?
Back
A tangent is a line that touches the circle at exactly one point.
5.
FLASHCARD QUESTION
Front
What is the relationship between a tangent and a radius at the point of tangency?
Back
The tangent is perpendicular to the radius at the point of tangency.
6.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
Back
The circumference (C) is given by the formula C = 2πr, where r is the radius.
7.
FLASHCARD QUESTION
Front
What is the area of a circle?
Back
The area (A) is given by the formula A = πr², where r is the radius.
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