Cho tam giac ABC co dien tich 64cm vuong. Tren canh AB lay diem Msao cho AM bang 1/4 .Tren canh AC lay diem N sao cho AN bang 1/4AC.Noi Bvoi N
a]Tinh dien tich tam giac BNC
b]Tinh ti so dien tich tam giac AMN va tam giac ABC
c]Qua A ve mot duong thang cat MN o K va cat BCo E.Tinh ti so KE/AK
Xin giup to nha to phai di hoc chieu nay
cho tam giac ABC vuong o A. 2 canh le voi goc vuong la :AC=15cm, AB=16cm. diem E nam tren canh AC co AE =1/2 AC. tu diem E , ke duong thang song song voi AB cat canh BC tai F . tinh do dai doan thang .
cho tam giac ABC . tren canh AC lay diem N sao cho AN bang 16 AC . tren canh AB lay diem P sao cho AP bang 25 AB . duong thang qua N va P cat BC o M . tinh MBMC ( MB tren MC ) ( vi minh ko tim thay dau gach ngang phan so nen viet nhu vay , cac ban giup minh nha , minh cam on ).
cho tam giac ABC co canh AC dai 6cm tren canh BC lay diem E sao cho EB = EC . BH la duong cao ha tu dinh B cua tam giac ABC va BH = 3cm .EH chia tam giac ABC thanh hai phan va dien tich tu giac CEH . tinh do dai doan thang AH .tich dien tich tam giac AHE
Cho tam giac ABC.Tu trung diem D cua canh BC,Ke duong vuong goc voi phan giac cua goc A cat AB tai M,AC tai N
a)Chung minh :BM=CN
b)Biet AB=C,AC=B .TINH AM,BM(gia su B>C) theo a va b
CAC BAN VE HINH HO MINH LUON NHA
cho tam giac abc co goc a vuong , ab= 30cm , ac=45cm.M la 1 diem tren canh ab sao cho am=20cm. Tu M ke duong thang song song voi canh bc cat canh ac tai diem n.Hoi: a/ tinh S abc, b/ tinh S anm
Cho goc xOy va goc yOz ke bu nhau, ve tia Om la tia phan giac cua goc xOy va tia On la tia phan giac cua goc yOz
a) Tinh goc mOn.
b) Ve tia Om' la tia doi cua tia Om, neu goc zOm' = 30 do. Tinh goc m'Oy.
c) Ve duong thang d khong di qua diem O, tren duong thang d lay 2015 diem phan biet. Tinh so goc co dinh la diem O va cac canh di qua 2015 diem tren duong thang d.
Cho goc xOy va goc yOz ke bu nhau, ve tia Om la tia phan giac cua goc xOy va tia On la tia phan giac cua goc yOz
a) Tinh goc mOn.
b) Ve tia Om' la tia doi cua tia Om, neu goc zOm' = 30 do. Tinh goc m'Oy.
c) Ve duong thang d khong di qua diem O, tren duong thang d lay 2015 diem phan biet. Tinh so goc co dinh la diem O va cac canh di qua 2015 diem tren duong thang d.
GoGo Cho tam giac ABV vuong goc taiA,AB=30,AC=20.Tren canh AC lay diem M sao cho AM=1/4 AC.Tu M ke mot duong thang song song voi AB va cat canh AC tai E
Tinh do dai canh EM