Circles… SOL 6.12 Mrs. Norman John Rolfe Middle School.

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Presentation transcript:

Circles… SOL 6.12 Mrs. Norman John Rolfe Middle School

Circles A circle is a set of points that are the same distance from a fixed point, A http://www.mathopenref.com/circle.html

Diameter The distance across the circle. The length of any chord passing through the center. It is twice the radius. http://www.mathopenref.com/diameter.html http://www.teachertube.com/view_video.php?viewkey=250aabb9ffb2683e0792

Radius The distance from the center to any point on the circle. It is half the diameter. http://www.mathopenref.com/radius.html

Chord A line segment linking any two points on a circle. http://www.mathopenref.com/chord.html

Circumference The circumference is the distance around the circle.

Pi = 3.14 3.14 http://www.youtube.com/watch?v=VqpWETqoD5Q

Calculating Circumference http://www.youtube.com/watch?v=fogehnFNDw0 http://www.teachertube.com/viewVideo.php?video_id=38335

Calculating the Area of a Circle Area enclosed by a circle - Math Open Reference A= r²

Now You Know All About Circles