# Area Related to Circles class 10 Notes Mathematics

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## CBSE Guide Area Related to Circles class 10 Notes

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## 10 Mathematics notes Chapter 12 Area Related to Circles

Download CBSE class 10th revision notes for Chapter 12 Area Related to Circles in PDF format for free. Download revision notes for Area Related to Circles class 10 Notes and score high in exams. These are the Area Related to Circles class 10 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the the best tips recommended by teachers during exam days.

CBSE Class 10 Mathematics
Revision Notes
CHAPTER 12
AREAS RELATED TO CIRCLES

1. Perimeter and Area of a Circle
2. Areas of Sector and Segment of a Circle
3. Areas of Combinations of Plane Figures
4. Miscellaneous Questions

• Perimeter or Circumference of the circle = $2\pi r,$ where $r$ is the radius of the circle.

Or Circumference of the circle = $\pi d,$ where $d$ is the diameter of the circle.

• Area of circle = $\pi {r^2}$ where ‘r’ is the radius of the circle.
• Area of Semi circle = $\frac{{\pi {r^2}}}{2}$
• Area enclosed by two concentric circles
$\pi (R^2-r^2)$
$\pi (R+r)(R-r) ; \ \ \ \ \ \ R>r$

where ‘R’ and ‘r’ are radii of two concentric circles.

• The arc length ‘$l$’ of a sector of angle $'\theta '$ in a circle of radius ‘r’ is given by

$l = \frac{\theta }{{{{360}^o}}} \times 2\pi r$

$l = \frac{\theta }{{{{180}^o}}} \times \pi r$

• If the arc subtends an angle $\theta$, then area of the corresponding sector is $\frac{\theta }{{{{360}^o}}} \times \pi {r^2}$

The sector which is less than the semicircular region, is called the minor sector and the sector, which is more than the semicircular region is called the major sector.

• Area of segment= Area of sector – Area of corresponding triangle
• Area of major segment = Area of circle – Area of minor segment
• Angle described by minute hand in 60 minutes = 360°. Angle described by minute hand in 1 minute $= \left( {\frac{{{{360}^o}}}{{60}}} \right) = {6^o}$

## Area Related to Circles class 10 Notes

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## CBSE Class-10 Revision Notes and Key Points

Area Related to Circles class 10 Notes. CBSE quick revision note for Class-10 Mathematics, Chemistry, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.

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