Podcast
Questions and Answers
What is the formula to calculate the circumference of a circle?
What is the formula to calculate the circumference of a circle?
- 2 * π * r^2
- π * r^2
- 2 * π * r (correct)
- 2 * r
What is the relationship between the diameter and the radius of a circle?
What is the relationship between the diameter and the radius of a circle?
- The diameter is three times the length of the radius
- The diameter is twice the length of the radius (correct)
- The diameter and radius are equal
- The diameter is half the length of the radius
What is the area of a circle if the radius is 5 units?
What is the area of a circle if the radius is 5 units?
- 25 square units
- 10Ï€ square units
- 20 square units
- 25Ï€ square units (correct)
What is the sum of the interior angles of a circle?
What is the sum of the interior angles of a circle?
What is the relationship between the circumference and diameter of a circle?
What is the relationship between the circumference and diameter of a circle?
What is the measure of the central angle that subtends an arc equal in length to the radius of the circle?
What is the measure of the central angle that subtends an arc equal in length to the radius of the circle?
Flashcards
Circumference formula
Circumference formula
2 * π * radius
Diameter vs. Radius
Diameter vs. Radius
Diameter = 2 * Radius
Circle Area (radius 5)
Circle Area (radius 5)
25Ï€ square units
Interior angle sum (circle)
Interior angle sum (circle)
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Circumference & Diameter
Circumference & Diameter
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Arc length related central angle
Arc length related central angle
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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.
