Cho tam giac abc can tai a , dg cao ah,bk cmr bc.bc=2ck.ac
CHO TAM GIAC ABC CAN TAI A VA DUONG CAO AD CO H LA TRUC TAM .TINH AD BIET AH=14CM, HB=HC=30CM
1. Cho tam giac ABC vuong tai A phan giac AH biet CD =68cm, BD =51cm. Tinh BH,HC
2. Cho tam giac ABC vuong tai A duong cao AH biet AB=7,5cm ; AH=6cm.
a) Tinh AC,BC
b) Tinh cos B, cos C
cho tam giac abc vuong tai a duong cao ah. Biết AB:AC=3:4, BC=15cm. Tính BH, HC
1.cho tam giac ABC vuong tai A ,goi AH la duong cao .biet rang \(\frac{AC}{AB}=\frac{5}{6'},BC=122cm\)
a)tinh BH,CH
b)tinh AH
2.cho tam giac ABC vuong o A,phan giac AD,duong cao AH.bietCD=68cm,BD=51cm.tinh BH,HC.
cho tam giac ABC, goi 0 la giao cua 3 duong cao AH,BK,CI
. a, cm OK.OB=OI.OC
b,cm tam giac OKI dong dang tam giac OCB
c,tam giac BOH dong dang tam giac BCK
d, BO . BK+CO.CI=BC^2