# 正弦定理的证明解读 - PowerPoint PPT Presentation

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#### Presentation Transcript

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ABCABCD

C

b

a

B

A

D

C

b

a

A

D

B

.

.

1

ABAB|AB

C

ABCABABc

ACb

CCDABABD

A

B

C

D

, SABC=

. SABC=

absinc=bcsinA=acsinB,abc,

.

ABC,Aj

C

j

,j

90-A,j

B

A

90-C.

,

j,

|j|

Cos90+|j|

Cos(90-C)=|j|

Cos(90-A).

.

.

asinC=csinA.

.

,C

j,j

90+C,j

90+B,

ABC,BC=a,AC=b,AB=c,ABC,

O,BOB,BB=2R.

BAB=90C =B

,,

1

A1

B