Pic Title: Trapezoidal perimeter, area Related Phrase: Perimeter, area Related pictures: Trapezoidal perimeter, area Source: http://www.cceschool.com/ Pic Description: 　　Semicircle area and Zhou Changgong style _ semicircle area and Zhou Changgong style painting 14) Analysis: The test round Zhou Changgong type c = 2π and Translated by Google No. / 12 Picture               Slide Show

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