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Units of Circle Video Lecture | Mathematics for Class 4: NCERT
FAQs on Units of Circle Video Lecture - Mathematics for Class 4: NCERT
| 1. What is the formula to find the circumference of a circle? |  |
Ans. The formula to find the circumference of a circle is 2πr, where π is a mathematical constant approximately equal to 3.14159 and r is the radius of the circle.
| 2. How do you calculate the area of a circle? | |
Ans. The area of a circle can be calculated using the formula A = πr^2, where A represents the area and r is the radius of the circle.
| 3. What is the relationship between the diameter and the radius of a circle? | |
Ans. The diameter of a circle is twice the length of its radius. In other words, if you multiply the radius by 2, you will get the diameter of the circle.
| 4. How can you find the radius of a circle if only the circumference is given? | |
Ans. If you know the circumference of a circle, you can find the radius by dividing the circumference by 2π. The formula is r = C / (2π), where r represents the radius and C is the circumference.
| 5. Can you find the area of a circle if only the diameter is given? | |
Ans. Yes, you can find the area of a circle if you know the diameter. The formula to calculate the area using the diameter is A = π(d/2)^2, where A represents the area and d is the diameter of the circle.
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