Circumference
Learn the basic elements of a circle, how to calculate its area and perimeter and also its positions in relation with a point, a line and another circle.

A line in the plane: positions regarding a circumference
Difficulty: 1
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A point in the plane: positions regarding a circumference
Difficulty: 1
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Area and perimeter of a circumference
Difficulty: 2
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Definition and basic elements of a circumference
Difficulty: 1
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Relative positions of two circumferences in the plane
Difficulty: 1
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