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They were aware, for example, that a triangle had a right angle opposite the hypotenuse when its sides were in a 3–4–5 ratio. [193] They were able to estimate the area of a circle by subtracting one-ninth from its diameter and squaring the result: Area ≈ [(8 ⁄ 9)D] 2 = (256 ⁄ 81)r 2 ≈ 3.16r 2, a reasonable approximation of the ...
Per-capita consumption of meat was 3.6 kg in 1961 and 11 kg by 1979. The result of this increased meat consumption brought about the rise of bulgogi restaurants, which gave the middle class of South Korea the ability to enjoy meat regularly. Meat eating continued to rise, reaching 40 kg in 1997, with fish consumption at 49.5 kg in 1998.