如图,在△ABC中,AE是中线,AD是角平分线,AF是高。填空
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(1)BE= =½ : (2)S△ABC= .
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1楼
解:(1)∵AE是中线, ∴BE=CE= BC, (2)∵AD是角平分线, ∴∠BAD=∠CAD= ∠BAC, (3)∵AF是高, ∴∠AFB=∠AFC=90°, (4)S△ABC=,S△ABE=, ∵BC=2BE, ∴S△ABC=2S△ABE, 故答案为CE,BC,∠CAD,∠BAC,∠AFC,2.
2楼
解:(1)∵AE是中线, ∴BE=CE= BC, (2)∵AD是角平分线, ∴∠BAD=∠CAD= ∠BAC, (3)∵AF是高, ∴∠AFB=∠AFC=90°, (4)S△ABC=,S△ABE=, ∵BC=2BE, ∴S△ABC=2S△ABE, 故答案为CE,BC,∠CAD,∠BAC,∠AFC,2.
3楼
解:(1)∵AE是中线, ∴BE=CE= BC, (2)∵AD是角平分线, ∴∠BAD=∠CAD= ∠BAC, (3)∵AF是高, ∴∠AFB=∠AFC=90°, (4)S△ABC=,S△ABE=, ∵BC=2BE, ∴S△ABC=2S△ABE, 故答案为CE,BC,∠CAD,∠BAC,∠AFC,2.