2 2S AB AC AB AC AB ACABC24 2 2 2 2AH AB AC C C. .SIN .COS= = = .2...
1 .
2
2
S AB AC AB AC AB ACABC
24
2
2
2
2
AH AB AC C C. .sin .cos= = =.
C Csin .cos
2
2
2
2
AB AC AB AC. .⇒ =
.
.sin .cos
S S C C
AEF
ABC
2
2
S AB AC AB AC AB ACABC
24
2
2
2
2
AH AB AC C C. .sin .cos= = =.
C Csin .cos
2
2
2
2
AB AC AB AC. ..
AEF
ABC