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[几何] 求三角形面积

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lrh2006 posted 2021-8-19 00:09 |Read mode
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已经求出点P坐标为(4,4),请教各位,能不能比较快的求出△OCD的面积?谢谢!
不好意思,图片太大,但是我不知道怎么缩小它

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乌贼 posted 2021-8-19 01:32
特殊值法,$ \triangle AOB $为等腰直角三角形时

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乌贼 posted 2021-8-19 01:39
不然慢慢求
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kuing posted 2021-8-19 02:03
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故 OC*OD=OP^2

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isee posted 2021-8-19 11:23
反比例函数,逆命题亦成立
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original poster lrh2006 posted 2021-8-19 12:05
这里果然是宝藏论坛,总是给我惊喜,谢谢各位巨佬

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