Areas Related to Circles — Chapter Summary
Madhya Pradesh Board · Class 10 · Mathematics
Summary of Areas Related to Circles for Madhya Pradesh Board Class 10 Mathematics. Part of the Madhya Pradesh Board Class 10 Mathematics syllabus.
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Overview
A sector is the portion of a circular region enclosed by two radii and the corresponding arc. A segment is the portion of a circular region enclosed between a chord and the corresponding arc. In a circle with centre O, OAPB is the minor sector and OAQB is the major sector. APB is the minor segment a
Key Concepts
The portion of the circular region
The portion of the circular region enclosed by two radii and the corresponding arc is called a sector of the circle. If the angle at the centre is θ,
OAPB is the minor sector
OAPB is the minor sector and OAQB is the major sector. The angle of the major sector is 360° − θ, where θ is the angle of the minor sector.
Area of the sector of angle
Area of the sector of angle θ = (θ/360) × πr², where r is the radius of the circle and θ is the angle of the sector in degrees. This comes from compar
Length of an arc of
Length of an arc of a sector of angle θ = (θ/360) × 2πr, where r is the radius of the circle and θ is the angle of the sector in degrees.
The portion of the circular region
The portion of the circular region enclosed between a chord and the corresponding arc is called a segment of the circle. The minor segment APB is the
Learning Objectives
- Identify sector, segment, minor sector, major sector, minor segment, and major segment.
- Use the area of a circle to derive the area of a sector.
- Find the length of an arc of a sector.
- Find the area of a segment by subtracting the area of triangle OAB from the area of the sector.
- Find the area of a major sector and a major segment using the area of the full circle.
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