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As the picture shows, why do you draw a circle in high school mathematics?

OCE is a straight line, so | oc | :| OE | =| y 1 |: | ye |, ODF is a straight line, so.

|OD|:|OF|=|Y2|:|Yf|

(| OC |:| OE |)(| OD |:| OF |)= | y 1 y2 |:| YeYf | = 32/| YeYf |

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