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单词 ProofOfBisectorsTheorem
释义

proof of bisectors theorem


Notice that the trianglesMathworldPlanetmath BAP and CAP have the same common height h, and if (BAP) and (CAP) denote their respective areas, we have

(BAP)(CAP)=BPh/2PCh/2=BPPC.

On the other hand

(BAP)=BAAPsinBAP2,(CAP)=CAAPsinCAP2

and so

(BAP)(CAP)=BAAPsinBAP/2CAAPsinCAP/2=BAsinBAPCAsinCAP.

We have obtained

BPPC=BAsinBAPCAsinCAP,

which is the generalizationPlanetmathPlanetmath to the theorem. In the particular case when AP is the bisectorMathworldPlanetmath, BAP=CAP, and thus sinBAP=sinCAP. Cancelling out the sines proves the bisector theorem.

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更新时间:2025/5/4 19:08:40