cho tam giac ABC co AB =6 ,AC=8, BC=10. goi K la trung diem cua doan thang BC ,duong trung truc cua doan thang BC cat AC tai M . goi D la hinh chieu vuong goc cua C tren duong thang BM chung minh rang : tam giac ABC vuong tai A

Cho doan thang AB goi I la giao diem cua AB voi duong trung truc cua doan thang H tren duong trung truc di lay diem khac ko trung voi I chung minh HA =HB

cho doan thang AB co O  la trung diem va d la duong trung truc. tren d lay diem M va N sao cho M va N  nam tren cung1 nua mat phang bo AB

CMR:a, tam giac AMN= tam giac BMN

         b, goc MAN= goc MBN

cho doan thang AB co O la trung diem va d la duong trung truc. tren d lay diem M va N sao cho 2 nua mat phang bo AB.

cmr;a, tam giac AMN = tam giac BMN

      b, MN la phan giac cua goc AMB

      c, goc MAN= goc MBN

cho▲abc co ab=6cm,ac=8cm,bc=10cm.goi k la trung diem cua doan thang bc duong trung truc cua doan thang bc cat ac tai m goi d la hinh chieu vuong goc cua c tren duong thang bm .cmr a)▲abc vuong tai a b)AB=DC c)3 duong thang AB,MK,CD di qua 1 diem giup minh voi mai mình phải nop cho co roi

Cho doan thang AB goi I la giao diem cua AB voi duong trung truc cua dian thang H tren duing trung truc di lay diem khac ko trung voi I chung minh HA =HB

tren duong thang b lay 3 diem A , B ,C . biet AB = 8 cm , BC = 4 cm . goi M ,N ,P lan luot la trung diem cua cac doan thang AB , AC , BC , chung to rang cac doan thang MN va AP co cung trung diem

a) ve doan thang pq=10 cm . ve duong trung truc cua doan thang pq 

 tren duong trung truc cua doan thang  pq lay diem m khong thuoc pq . qua diem m ve duong thang d\\ pq

cho tam giac abc vuong tai a,co ab=9,bc=15
a) tinh do dai canh ac va so ssanh cac goc cua tam giac abc
​b) tren tia doi cua tia ab lay diem d sao cho a la trung diem cua doan thang bd.chung minh tam giac bcd can
c) goi k la trung diem cua canh bc. duong thang dk cat canh ac tai m.tinh do dai doan thang mc
d) duong trung truc cua canh ac cat duong thang dc tai q.chung minh ba diemb,m.q thẳng hàng