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Circles

Circles

Author: Simone Grey
Description:
  • Develop techniques for estimating the area of circles.
  • Develop strategies for comparing and organizing data.
  • Use ideas about area and perimeter to solve practical problems.
  • Continue to develop a conceptual understanding of area and perimeter.

In this tutorial, you will review and learn important basic concepts to find the area and perimeter of circles.

BrainPOP: http://www.brainpop.com/math/geometryandmeasurement/circles/

Wednesday, March 13, 2013: The questions for tonight's homework assignments can be found at http://bit.ly/12PtlS0 .

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Tutorial

Circles: Circumference, Diameter & Radius (Part 1)

NOTICE: If you were having trouble viewing the video before it has been fixed. Sorry. =)

In this tutorial, you will learn about the important basic concepts needed to find the circumference and area of circles. Please be sure to have your notebook with you as you are watching it. Write down anything that YOU feel is important and will help you remember the key facts! You are encouraged to watch the tutorial, take a break, then watch it again. Just in case you missed something. =)

Don't forget to complete the questions afterwards. http://bit.ly/12PtlS0

Circles: Circumference, Diameter & Radius (Part 2)

In this tutorial, you will continue working on sample problems as discuss in the first tutorials.

Don't forget to complete the questions afterwards. http://bit.ly/12PtlS0

Circumference, Diameter & Radius

Review slides for practice problems and notes.

Radius - Diameter - Circumference

It would be a good idea to copy this into your notebook.

Where does TT (pi) come from?

For those of you who may be wondering where TT (pi) comes from, here is a cool video that shows you. It's simply the number you get when you divide the circumference by the diameter. As TT (pi) is an irrational number (it never ends), it's easier to simply write it as a symbol, rather than attempt to write out 3.14159265358979323846264338327950288419716939937510582097494459230781
6406286208998628034825342117067982148086513282306647093844609550582231
7253594081284811174502841027019385211055596446229489549303819644288109
7566593344612847564823378678316527120190914564856692346034861045432664
8213393607260249141273724587006606315588174881520920962829254091715364
3678925903600113305305488204665213841469519415116094330572703657595919
5309218611738193261179310511854807446237996274956735188575272489122793
8183011949129833673362440656643086021394946395224737190702179860943702
7705392171762931767523846748184676694051320005681271452635608277857713
4275778960917363717872146844090122495343014654958537105079227968925892
3542019956112129021960864034418159813629737477130996051870721134999999
8372978049951059731732816096318950244594553469083026425223082533446850
3526193118817101000313783875288658753320838142061717766914730359825349
04287554687311595628638823537875937519577818577805321712268066130019 27876611195909216420198968792314560827586240560078346756......

Imagine having to write that every time you needed to do a math problem.

Circle Music Video

From Fantastikos Mathematikos DVD and CD: 15 math topics set to original music and animation by Peter Weatherall.

Worksheet: Circumference of a Circle

Directions: Find the circumference of each circle. Use 3.14 for pi.

Full Screen

Worksheet: Radius & Diameter

Directions: Find the radius and diameter of each circle.

Full Screen

Worksheet: Circles

Directions: Write the names of each circle, radius and diameter.

Full Screen

Homework Questions: Wednesday, March 13