(010)
9
9
A
設為入ABC 之垂心,若A(0,0),B(6,0),C(4,403),則:
(1) AĦ · AB= 24.
2) =
(2) AH · AC= 24
AB= (610), AC = (4,453)
o
24
TEDAHLAB
口
(2)
B
C
(41413)
= LACICH - AB
AH ACEASTA RC 16,
=ĀC AB ICH AB
- AB ALIBHAL
ABITH
''AČ I BH BH - AC=0
i CH AB=0
"AH - AC = ABAC = (610). (4,453)
- AH-AB=AL AB
= 24
=(4,453). (6.0)
、
=
= 24