Cho
ABC có
B
=900
, AD là tia phân giác của  (D
BC). Trên...
Mathematics, 30.07.2021 04:50 zitterkoph
Cho
ABC có
B
=900
, AD là tia phân giác của  (D
BC). Trên tia
AC lấy điểm E sao cho AB=AE; kẻ BH
⊥
AC (H
AC)
a/ Chứng minh:
ABD=
AED; DE
⊥
AE
b/ Chứng minh AD là đường trung trực của đoạn thẳng BE
c/ So sánh EH và EC.
Answers: 2
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