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- 20 17 Wuhan four-tone mathematics answer
20 17 Wuhan four-tone mathematics answer
Answer: Proof: ∵CD is the height on the side of AB,
∴∠CDA=∠CDB.
* ADCD = CDBD，
∴△ACD∽△CBD.
∴∠A=∠DCB.
∫∠A+∠ACD = 90，
∴∠DCB+∠ACD=90。
Namely ∠ ACB = 90.
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