-In sets of colour:
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- The diameter is a line across the centre that touches both ends of the circle!- The radius is the distance from the centre of the circle to it's outer edge. (Also known as "Radii"
- The circumference of the circle is it's outer shape. (Well you get the point, it's pretty much the whole circle.)
- The arc of a circle is just a part of it's circumference.
- Lastly in this picture is the sector of the circle is the part where it's all yellow, honestly 2 radius much corner a section of the circle like a slice of pizza and what's left is the sector.
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For any more questions watch this video in the following link below, Thank you!:
http://www.youtube.com/watch?v=1qSXPlDv1gQ
*Not the best video you can find*
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