Cho tam giác ABC có AB<AC. Tia phân giác của goác BAC cắt BC tại D. Chứng minh rằng CD>BD
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CM
22 tháng 1 2019
a,i, Tìm được AB=3cm và AC = 6 3 cm
ii, Ta có: A B B D = A C B C = cos A B C ^ = cos 60 0 = cos A C D ^ = A C C D
b, Ta có: 1 A H 2 = 1 A C 2 + 1 A D 2
3 tháng 6 2022
Câu 2:
a: Xét tứ giác ADBH có AB cắt DH tại trung điểm của mỗi đường
nên ADBH là hình bình hành
mà \(\widehat{AHB}=90^0\)
nên ADBH là hình chữ nhật
b: Để ADBH là hình vuông thì BA là tia phân giác của góc DBH
=>\(\widehat{ABC}=45^0\)
15 tháng 6 2022
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21 tháng 12 2021
bài 2:
ta có: AB<AC<BC(Vì 3cm<4cm<5cm)
=> góc C>góc A> góc B (Các cạnh và góc đồi diện trong tam giác)
Bài 3:
*Xét tam giác ABC, có:
góc A+góc B+góc c= 180 độ( tổng 3 góc 1 tam giác)
hay góc A+60 độ +40 độ=180độ
=> góc A= 180 độ-60 độ-40 độ.
=> góc A=80 độ
Ta có: góc A>góc B>góc C(vì 80 độ>60 độ>40 độ)
=> BC>AC>AB( Các cạnh và góc đối diện trong tam giác)
LN
Lưu Nguyễn Hà An
CTVHS
15 tháng 2 2022
bài 2:
ta có: AB <AC <BC (Vì 3cm <4cm <5cm)
=> góc C>góc A> góc B (Các cạnh và góc đồi diện trong tam giác)
Bài 3:
*Xét tam giác ABC, có:
góc A+góc B+góc c= 180 độ( tổng 3 góc 1 tam giác)
hay góc A+60 độ +40 độ=180độ
=> góc A= 180 độ-60 độ-40 độ.
=> góc A=80 độ
Ta có: góc A>góc B>góc C(vì 80 độ>60 độ>40 độ)
=> BC>AC>AB( Các cạnh và góc đối diện trong tam giác)
HT mik làm giống bạn Dương Mạnh Quyết
10 tháng 3 2022
Bài 1:
a: Xét ΔABC có \(AC^2=AB^2+BC^2\)
nên ΔABC vuông tại B
b: XétΔABC có BC<AB<AC
nên \(\widehat{A}< \widehat{C}< \widehat{B}\)