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Circles Class 9 PPT

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FAQs on Circles Class 9 PPT

1. What is a circle?
Ans. A circle is a geometric shape consisting of all points in a plane that are equidistant from a fixed center point. It is defined by its radius, which is the distance from the center to any point on the circle.
2. How are the diameter and radius of a circle related?
Ans. The diameter of a circle is twice the length of its radius. In other words, the diameter is the longest chord that can be drawn in a circle, passing through the center and touching two points on the circumference.
3. What is the formula to calculate the circumference of a circle?
Ans. The formula to calculate the circumference of a circle is C = 2πr, where C represents the circumference and r represents the radius of the circle. π is a mathematical constant approximately equal to 3.14159.
4. How do you find the area of a circle?
Ans. The formula to find the area of a circle is A = πr^2, where A represents the area and r represents the radius of the circle. π is a mathematical constant approximately equal to 3.14159.
5. Can a circle be divided into equal parts?
Ans. Yes, a circle can be divided into equal parts. The most common way to divide a circle into equal parts is by using central angles. For example, if you divide a circle into 360 equal central angles, each angle will have a measure of 1 degree, resulting in 360 equal parts.
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