Circle and Disk in Geometry

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What is the definition of a circle?
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A circle is a set of all points in a plane that are a fixed distance from a center point.
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What is the center of a circle?
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The center of a circle is the point that is equidistant from all points on the circle.
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What is the radius of a circle?
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The radius is the distance from the center of the circle to any point on its perimeter.
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What is the diameter of a circle?
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The diameter is twice the length of the radius, passing through the center of the circle.
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How do you calculate the circumference of a circle?
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The circumference is calculated using the formula 2πr, where r is the radius.
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What is the area of a disk?
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The area of a disk is calculated using the formula πr², where r is the radius.
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What is a chord in a circle?
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A chord is a line segment with both endpoints on the circle.
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What is a tangent to a circle?
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A tangent is a straight line that touches the circle at exactly one point.
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What is a sector of a circle?
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A sector is a portion of a circle enclosed by two radii and the arc between them.
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What is a semicircle?
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A semicircle is half of a circle, formed by dividing a circle along its diameter.
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What is an arc of a circle?
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An arc is a part of the circumference of the circle.
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How do you find the length of an arc?
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The length of an arc is found by multiplying the circle's radius by the arc's central angle in radians.
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What is a concentric circle?
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Concentric circles are two or more circles with the same center but different radii.
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What is a circular segment?
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A circular segment is the region between a chord and the corresponding arc.
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What is the relationship between a circle and a disk?
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A circle refers to the boundary or circumference, while a disk is the interior region within the circle.
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