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Tam giac ABC co do day lan luot la 3cm, 8cm, 10cm. Dien tich tam giac ABC
dien tich tam giac co do dai 3 canh la 12cm,16cm,20cm la...cm^2
Hai tam giac ABC va A'B'C' co dong dang voi nhau,biet do dai ba canh AB,AC,BC lan luot la 4cm,5cm,6cm va chu vi tam giac A'B'C' la 30 cm.Tinh do dai cac canh A'B'C'
cho tam giac ABC co AB =6cm , AC=4cm , tren canh AB lay diem D ,tren canh AC lay diem E sao cho AD =2cm , AE=3cm
a) chung minh tam giac ADE dong dang vs tam giac ACB
b) biet tam giac ABC cho dien tich la S , tinh dien tich tam giac ADE
cho tam giac ABC co do dai ba duong trung tuyen la 15; 36; 39 tinh dien tich tam giac
he so tu do cua da thuc: \(\left(4x+5\right)\) \(\left(2x-3\right)\)Cho tam giac ABC co duong cao 3.\(\sqrt{ }3\) . Tinh chu vi tam giac ABC.Tam giac ABC co dien tich SABC = 121 .\(\sqrt{ }3\) .Tinh do dai canh tam giac.
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cho tam giac ABC co do dai cac canh bang a,b,c dien tich tam giac =S CMR 6S<= a^2+b^2+c^2
cho tam giac ABC vuong tai A co AB=6cm AC= 8cm ke duong cao AH trung tuyen AM cua ABC. qua M ke ME//ACva MF//AB
1. CM: tu giac AEMF la HCN
2. goi O la giao diem cua AM va EF .CHung minh :
a)tu giac CHOF la hinh thang
b) tia HF la tia phan giac cua OHC
3. tinh do dai doan thang AH
cho tam giac ABC vuong tai A co AB=6cm AC= 8cm ke duong cao AH trung tuyen AM cua ABC. qua M ke ME//ACva MF//AB
1. CM: tu giac AEMF la HCN
2. goi O la giao diem cua AM va Ì .CHung minh :
a)tu giac CHOF la hinh thang
b) tia HF la tia phan giac cua OHC
3. tinh do dai doan thang AH