cho tam giac ABC vuong tai,duong cao AH,biet HB=25cm,HC=36cm,AH=30cm.
a/ chung minh tam giac HBA dong dang voi tam giac HAC.
b/tinh do dai cac doan thang AB,BC,AC
cho tam giac ABC vuong tai A. duong cao tai AH,duong phan giac BD biet AB 3cm,AC 4cm.
a) tinh do dai doan AD va DC
b) goi k la giao diem cua AH va BD (CM : AB.BK=BD.HB)
c) CM tam AKD Can.
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
Cho tam giac ABC vuong o A. Dien tich tam giac bang 30 cm2. Tinh do dai duong cao AH cua tam giac ABC biet AB-AC=7 cm
cho tam giac abc vuong tai a duong phan giac bd biet ab = 6 ac =8 tinh ad dc goi k la giao diem cua duong cao ah ba bd chung minh tam giac ahb dong dang voi tam giac cab chung minh abk dong dang voi tam giac bad tu do suy ra ab*bk = bd*hb giup mik voi
cho tam giac ABC vuong tai Aco AB =3cm , AC =4cm .Tren hai canh ABva AC lan luotlay 2 diem M,N sao cho BM=2AM va AN =1/2 CN
a, chung to MN//BC va tinh do dai MN
b,Duong cao AH cuatam giac ABC catmn tai K , tinh do dai AHva AK
cho tam giac abc vuong tai a co diem m nam tren bc. go0i d va c la cac duong vuong goc ke tu m den ab va ac diem m nam o vi tri nao thi d co do dai nho nhat. tinh do dai nho nhat do, biet ab = 15cm ac= 20cm
Cho tam vice ABC can tai A duong cao AH phan giac BC .Tinh cac goc cua tam giac ABC biet BD =2AH
Cho tam giac ABC vuong can tai A. Ve phia ngoai tam giac ABC, ve tam giac BCD vuong can tai B. Ke BH vuong goc vs CD. Biet CD = căn bậc 128 cm. Do dai AH la
