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# Circles Formulas for Class 9 Maths Chapter 10

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## Circles Formulas for Class 9 Maths Chapter 10

Are you looking for Circles formulas or important points that are required to understand Circles for class 9 maths Chapter 10? You are the right place to get all information about Circles Class 9 maths chapters 10. Circles formulas play a vital role in preparing you for the class 9 exam as well as higher studies. Circles formulas are very helpful for better scores in the exam.  Check Circles formulas according to class 9:

 $\ Area\;of\;a\;circle =\pi r^{2}=\frac{{\pi}d^{2}}{4}=\frac{{C} \times {r}}{2}$ $\ Perimeter\;of\;Circle = 2 \pi r$ $\ Area\;of\;a\;half\;circle =\frac{{\pi}r^{2}}{2}$ $\ Area\;of\;a\;Quarter\;circle =\frac{{\pi}r^{2}}{4}$ $\ Area\;of\;Sector\;of\;a\;circle: A=\frac{θ}{360}\pi r^{2}$ $\ Length\;of\;an\;arc\;of\;a\;sector: Arc=\frac{θ}{360}{2 \pi r}$ $\ Sector\;angle\;of\;circle = \frac{180 \times l}{\pi r}$ $\ Area\; of\;the \;sector = \frac{θ}{2} \times r^{2}$ $\ Area \;of\; the \;circular \;ring = \pi \times (R^{2} – r^{2})$ Where,r is the radius of the circle.d is the diameter of the circle.C is the circumference of the circle. θ is the Angle between two radius R is the Radius of Outer Circle

#### Summary of Circles

We have shared very important formulas for Circles which helps to score in the class 9 exams. If you have any questions and doubts related to Circles please let me know through comment or mail as well as social media. When you understand the formulas behind each Circles topics then it would be easier to solve the most complex problems related to Circles too.

#### NCERT Solutions For Class 9 Maths by Chapters

• Chapter 1 – Number Systems
• Chapter 2 – Polynomials
• Chapter 3 – Coordinate Geometry
• Chapter 4 – Linear Equations in Two Variables
• Chapter 5 – Introduction to Euclids Geometry
• Chapter 6 – Lines and Angles
• Chapter 7 – Triangles
• Chapter 8 – Quadrilaterals
• Chapter 9 – Areas of Parallelograms and Triangles
• Chapter 10 – Circles
• Chapter 11 – Constructions
• Chapter 12 – Heron’s Formula
• Chapter 13 – Surface Areas and Volumes
• Chapter 14 – Statistics
• Chapter 15 – Probability

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