cho tam giac ABC vuong goc tai AB.ab=20cm, AC= 15cm. tren ab lay diem M sao cho M=4cm. tu M ke duong thang song song voi AC cat BC tai N. tinh dien tich MNCA.

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 tam giac ABC co day BC=36cm va gap ruoi chieu cao ha tu A 

a) tinh dien tich tam giac ABC

b)Tren AB lay diem M sao cho BM=1/3AB . Tu M ke duong song song voi BC cat AC tai N . Noi M voi N . Tinh dien tich tu giac MNCB?

 cho hinh tam giac ABC co dien tich 516 m2. tren canh BC lay hai diem P,Q sao cho BP = PQ = QC . tu P ke duong thang song song voi AC , tu Q ke duong thangsong song voi AD , HAI DUONG THANG NAY CAT NHAU TAI DIEM M . tinh dien tich hinh tam giac bcm

Cho tam giac vuong abc vuong tai a, co ab=20cm, ac=30cm Tren ab lay M sao cho M =5cm Tu M ke duong thang song song voi ac cắt bc tai n . Tinh mn

Cho tam giac abc vuong tai a. Ke ah vuong goc voi bc tai h. Tren tia doi cua tia ha lay diem d sao cho ha=hd.

a) chung minh tam giac ahd=tam giac dhc

b)tren tia dc lay diem k sao cho c la trung diem cua dk. Chung minh ak||bc

c) tu c ke duong thang song song voi ab cat ak tai m. Doan thang bm cat ac tai q. Chung minh am+cm>2mq

tam giac abc co ab bang 12 cm ac bang 15 cm bc bang 16 cm tren ab lay m sao cho am bang 3cm tum ke duong thang song song bc cat ac tai n cat trung tuyen ai tai k a tinh mn b chung minh k la trung diem mn c tren tia mn lay p sao cho mp bang 8 cm noi pi cat ac tai q chung minh tam giac qic dong dang voi tam giac aiqn

cho tam giác abc = 612 cm2 tren canh bc lay diem p,q sao cho pb=pq=qc ke diemp duong thang song song voi ac tu diem q song song voi ab hai duong thang cat diem m tinh Sbms

tam giac ABC vuong o A AC bang 20cm ab bang 30cm Mla 1 diem tren canh Ac va co ti so AM tren Ac la 1/3 tu M KE DUONG SONG song voi AB CAT BC tai E tinh canh ME