The circumference is the distance around a circle....We can calculate the circumference of a circle if we know the value of either the diameter or the radius of the circle.
These formulas are very useful...
Try to memorize the formulas...
Try to understand how to find the circumference of a circle with the given radius or diameter...
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1. Sally purchased a mini CD that was 5 inches in diameter. What is the circumference of the CD?
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| 2. At the railroad crossing, Mike noticed the crossing sign. He and his friends discovered that the circumference was 69.08 inches. What was the diameter of the sign? | |
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3. The basketball team plays with a ball with a radius of 6 inches. What is the circumference of each basketball?
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4. Nathan and three of his friends were building a duck blind to go hunting. They knew for all of them to fit inside that they needed a circumference of 15.7 yards. What diameter must the blind have for it to have the correct circumference?
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5. If the diameter of a circle is 15 cm, what is the circumference of the circle?
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| 6. When measuring the hula hoop in class, group C discovered that it had a radius of 7 inches. What is the circumference of the hula hoop? | |
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| 7. The laundry basket that Mrs. Smith uses for recycling has a diameter of 25 cm. She wants to move the basket to another place in her classroom. In order for her to complete this task, she must know the circumference of the basket. Please find teh circumference of the basket so Mrs. Smith can determine where to place it. | |
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| 8. When determine the circumference of a circle, you must find the ____________ and multiply it by 3.14. | |
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| 9. The radius of a circle tells | |
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10. The table we have to sit at has a circumference of 6.28 yards. We need to find the diameter of the table.
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The circumference of a circle is same as the perimeter that is the distance around the outer edge.
ReplyDeleteThe formula of circumference is = 2 pi r (pi's symbol)
where r = the radius of the circle
and pi = 3.14(Approx)
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