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Questions and Answers
What is the formula to calculate the circumference of a circle?
What is the relationship between the diameter and the radius of a circle?
What is the area of a circle if the radius is 5 units?
What is the sum of the interior angles of a circle?
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What is the relationship between the circumference and diameter of a circle?
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What is the measure of the central angle that subtends an arc equal in length to the radius of the circle?
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Study Notes
Circle Properties
- The circumference of a circle can be calculated using the formula: Circumference = 2 × π × radius
- The diameter of a circle is twice the length of the radius (Diameter = 2 × radius)
- The radius of a circle is half the length of the diameter (Radius = Diameter ÷ 2)
Circle Area
- The area of a circle can be calculated using the formula: Area = π × radius²
- If the radius of a circle is 5 units, the area would be approximately 78.5 square units (Area = π × 5²)
Angles in a Circle
- The sum of the interior angles of a circle is 360 degrees
- A central angle that subtends an arc equal in length to the radius of the circle measures 60 degrees
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Description
Test your knowledge of circles with this class 9 CBSE quiz. Answer questions about the circumference formula, the relationship between diameter and radius, and calculate the area of a circle with a given radius.
