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Circles

1) A 'line' connecting one side of the circle to the opposite end would be called a . . .
2) Which formula is used for circumference?
3) The radius is ___ the diameter.
4) A circle is a polygon.
5) A circle is a curve of constant width.
6) Manhole covers are usually shaped like a circle because . . .
7) A part of the circumference is called a/an _____.
8) The Olympics uses ____ circles as its logo.Hint

9) In targets used for archery, there is an outer ring and a solid circle in the middle. What is that circle called?
10) The ratio of the circumference to the diameter is known as ______.Hint


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