Finding Circumference for 4 th and 5 th Grade By Andrea Klee.
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Transcript of Finding Circumference for 4 th and 5 th Grade By Andrea Klee.
![Page 1: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/1.jpg)
Finding CircumferenceFinding Circumferencefor 4for 4thth and 5 and 5thth Grade Grade
By Andrea Klee
![Page 2: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/2.jpg)
What Is CircumferenceWhat Is Circumference
Circumference is the distance all the way around a circle.
The equation to find circumference is 2r or multiplied by the diameter of the circle.
![Page 3: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/3.jpg)
Some Terms DefinedSome Terms Defined is said as pie, like the kind you eat
– about 3.14
r is the radius of a circle – or half the distance across a circle
d is the diameter of a circle– or the distance all the way across a circle– or two radii added together
![Page 4: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/4.jpg)
How To Find CircumferenceHow To Find Circumference
If you have the radius:– Multiply the radius by 2 to get the diameter.– Multiply this answer by 3.14 ( ).
If you have the diameter:– Multiply the diameter by 3.14 ().
![Page 5: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/5.jpg)
Let’s Try A ProblemLet’s Try A Problem
Find the diameter or the radius.
We are going to find the radius.
What is the radius of this circle?
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Problem ContinuedProblem Continued
The radius is 5.Next, multiply the radius by 2 to get the
diameter.
Last, multiply the diameter by or 3.14.
![Page 7: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/7.jpg)
Problem SolvedProblem Solved
The circumference of the circle is 31.4.
![Page 8: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/8.jpg)
Here’s Another ProblemHere’s Another Problem
Find the circumference of this circle.
![Page 9: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/9.jpg)
SolutionSolution
The diameter is 6.
Multiply the diameter by (3.14).
The Circumference is 18.84.
![Page 10: Finding Circumference for 4 th and 5 th Grade By Andrea Klee.](https://reader035.fdocuments.us/reader035/viewer/2022072010/56649dca5503460f94ac0645/html5/thumbnails/10.jpg)
LinksLinks
Math.com has everything you might want to know about the parts of circles.
This site defines circle, pie, circumference, diameter, and radius.
– http://www.math.com/tables/geometry/circles.htm
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LinksLinks
Prime Mathematics Enrichment is a magazine that has fun projects to do involving circles.
– http://www.nrich.maths.org.uk/prime/feb01/magazine.html
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LinksLinks
Math Forum’s Ask Dr. Math This page is a letter sent to Dr. Math asking how
the circumference of the Earth was first measured. This offers a little history about circumference.
– http://mathforum.org/library/drmath/view/58988.html