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Pie Chart

Dividing the Size of the United States with One Circle: Playfair's 1805 "Divided Circle"

Dividing the Size of the United States with One Circle: Playfair's 1805 "Divided Circle"

The Same Square Miles, Drawn as the Area of a Circle and as the Angle of a Sector: Playfair in 1801 and 1805

The Same Square Miles, Drawn as the Area of a Circle and as the Angle of a Sector: Playfair in 1801 and 1805