| 這題據說比較難，打星號的。事後發現屬於“靈機一動”。 |
| 送交者: 零加一中 2017年01月04日13:44:07 於 [靈機一動] 發送悄悄話 |
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∆ABC, ∠C = 90. AB = c, BC = a, CA = b. CL is an altitude on AB.Using CL as diameter to make a circle.The circle cuts CA at J and CB at K. JK = ? |
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| 實用資訊 | |
