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20 questions
The distance halfway across the circle is called the...
radius
diameter
circumference
area
Is the red line a radius or diameter of the circle?
Radius
Diameter
What are the formulas for circumference of a circle?
C = π r
C = π d
C = 2 π r
C = 2 π d
How do you find the area of a circle?
What is the area of a circle with the diameter of 10 cm ?
66 cm^{2}
78.5 cm^{2}
66.5 cm^{2}
314 cm^{2}
what is the area of this circle ?
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