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Quick Revision: Circles Video Lecture | Mathematics (Maths) Class 9

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FAQs on Quick Revision: Circles Video Lecture - Mathematics (Maths) Class 9

1. What is a circle in geometry?
Ans. A circle in geometry is a closed curve where all points are equidistant from a fixed point called the center.
2. How do you find the circumference of a circle?
Ans. The circumference of a circle can be found using the formula: Circumference = 2 x π x radius.
3. What is the relationship between the radius and diameter of a circle?
Ans. The diameter of a circle is twice the length of its radius. In other words, Diameter = 2 x Radius.
4. How do you find the area of a circle?
Ans. The area of a circle can be calculated using the formula: Area = π x radius^2.
5. Can you find the radius of a circle if you know its circumference?
Ans. Yes, the radius of a circle can be found using the formula: Radius = Circumference / (2 x π).
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