This document discusses the areas of circular sectors and segments. It defines a sector as the region between two radii and an arc, and provides a formula to calculate the area of a sector based on its central angle and radius. A segment is defined as the region between a chord and arc, and the document explains that the area of a segment can be calculated by taking the area of its corresponding sector and subtracting the area of the triangular portion cut off by the chord.

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3. Introduction
• An arc of a circle is
any connected part of the
circle's circumference.
A sector is a region bounded by
two radii and an arc lying
between the radii, and
a segment is a region bounded by
a chord and an arc lying
between the chord's endpoints.

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6. • A circular sector or circle
sector, is the portion of
a circle enclosed by
two radii and an arc, where
the smaller area is known as
the minor sector and the
larger being the major sector.

8. Its area can be calculated
as described below:

9. Also, if θ refers to the
central angle in degrees, a
similar formula can be
derived:

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12. • A circular segment is an
area of a circle informally defined
as an area which is "cut off" from
the rest of the circle by a chord.
The circle segment constitutes the
part between the secant and an
arc, excluding the circle's center.

14. • The area of the
circular segment is equal
to the area of
the circular sector minus
the area of the
triangular portion.
The radius is

15. • The arc length is
• The area is

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