Question

Anxi0522.lyc

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感恩QQ

xd=by =Y
at
za+zd+zc=15r.
a+d+ c = 18.
7類題2
28 by b= r.
如右圖,△ABC中,a、b、c分別表示LA、CB、ZC之對邊長,
若a、b、c邊上的高分別為=6、B=3、h=4,
sin A: sin B: sin C = 2=4=3.
44
答
DABU9
axha
bxhb
Cha
why?
> a= b = c
ha
ho
Cha=hb=hc = =
Sin SinB sinc
2=4=3
4
2=4-3.
D
a
z
E
4

Answer 1

綾

依正弦定理得
a/sinA = b/sinB = c/sinC
即sinA：sinB：sinC = a：b：c
又三角形ABC面積 = a*ha/2 = b*hb/2 = c*hc/2
即6a = 3b = 4c
(同除以6 3 4最小公倍數12)
a/2 = b/4 = c/3
a：b：c = 2：4：3