a)
AB=4 ;AC=5;AC'=2. Calculează AB'
AB’: AB=AC’:AC => AB’ x AC =AB x AC’
AB’=ABxAC’:AC
AB’=4x2:5=8:5=1,6cm
b)AB'=3;AC'=7;AC=21.
Calculează AB
AB’: AB=AC’:AC => AB’ x AC =AB x AC’
AB=AB’xAC:AC’
AB=3x21:7=3x3=9cm
c)BB'=4;BA=16;CC'=6.
Calculează AC
AB: BB’=AC: CC’ => AB x CC’ =AC x BB’
AC=ABxCC’:BB’
AC=16x6:4=24 cm
d)AC'=4; CC'=6; BB'=3.
Calculează AB
AC=AC’+CC’=4+6=10cm
AB: BB’=AC: CC’ => AB x CC’ =AC x BB’
AB=ACxBB’:CC’=10x3:6=5 cm
sau
AB’: BB’=AC’: CC’ => AB’ x CC’ =AC’ x BB’
AB’=AC’xBB’:CC’=4x3:6=2 cm
AB=AB’+BB’=2+3=5 cm