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The treatise also provides values of π, [106] which Chinese mathematicians originally approximated as 3 until Liu Xin (d. 23 AD) provided a figure of 3.1457 and subsequently Zhang Heng (78–139) approximated pi as 3.1724, [113] as well as 3.162 by taking the square root of 10.
The population density was 833.7 inhabitants per square mile (321.9/km 2). There were 12,728 housing units (12,000 occupied) at an average density of 360.0 per square mile (139.0/km 2 ). The racial makeup of the city was 87.7% White , 2.7% African American , 0.3% Native American , 4.1% Asian , 0.1% Pacific Islander , 2.4% from other races , and ...
There were 48,621 households, out of which 27.5% had children under the age of 18 living with them, 41.1% were married couples living together, 12.9% had a female householder with no husband present, and 42.5% were non-families. 36.1% of all households were made up of individuals, and 11.7% had someone living alone who was 65 years of age or older.
Males had a median income of $61,271 versus $39,835 for females. The per capita income for the township was $35,349. About 1.6% of families and 2.8% of the population were below the poverty line, including 2.1% of those under age 18 and 4.8% of those age 65 or over. [44] [45]
6.7% of the population was under the age of 5, and 21.1% was under the age of 18. 11.1% of the population was 65 years of age or older. 50.9% of the population was female. The per capita income for the city was $31,411. 11.1% of the population was below the poverty line.
In 2015, 11.4 percent of Kansas City households were without a car, which was virtually unchanged in 2016 (11.3 percent). The national average was 8.7 percent in 2016. Kansas City averaged 1.58 cars per household in 2016, compared to a national average of 1.8 per household.
The first mass production PHEV available in the U.S. market, the 2011 Chevrolet Volt, with an EPA rated all-electric range of 35 mi (56 km) and an additional gasoline-only extended range of 344 mi (554 km), has an EPA combined city/highway fuel economy of 93 MPG-e in all-electric mode, and 37 mpg ‑US (6.4 L/100 km; 44 mpg ‑imp) in gasoline ...