Question

y

請問這題是從哪裡看出來相似的

ZACD=2B AC =8 CD =9, BC =18,
16
則 AB
=
, AD
=
4
8
C
6
18
B

Answer 1

✨ Best Answer ✨

qn

注意∠A是共用角

△ACD 和 △ABC
∠ACD = ∠ABC (條件)
∠CAD = ∠BAC (共用角)
所以 △ACD ~ △ABC (AA相似)