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To multiply two numbers geometrically, Descartes said: Let AB be taken as unity, and let it be required to multiply BD by BC. I have only to join the points A and C, and draw DE parallel to CA; then BE
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To multiply two numbers geometrically, Descartes said: Let AB be taken as unity, and let it be required to multiply BD by BC. I have only to join the points A and C, and draw DE parallel to CA; then BE is the product of the lengths of BD and BC. Show that the length of BE is the product of the lengths of BD and BC

User Ctomek
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User Ivan Davidov
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