Printing allowed literature to become more available during the Tang Dynasty
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how do you find the radius of a circle if you only know the area of the circle. Do you somehow reverse the Pi formula. and hence if you know A, divide it by π and then take the square root to find r.
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Feudalism was the social system during medieval Europe. The roles of lords was to give their loyalty ad military assistance to the king. The role of the vassals was to give homage and military service to the lords. I hope this helps:))
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