Răspuns:
Explicație pas cu pas:
7
a)BD=4 cm;AB=10 cm;BC=15 cm aplicam t Thales
BD/AB=BE/BC BE=BD×BC/AB=4×15/10=6 cm
b)EC=3 cm;BE=12cm;AD=6 cm; BC=ED+BE=3+12=15 cm
AD/AB=EC/BC AB=6x15/3=30 cm
c)BE=7cm;AD=10cm;AB=24 cm
BE/BC=BD/AB BD=AB-AC=24-10=14 cm
BC=24x7/14=12 cm
d)AD=6cm;AB=16cm;EC=18 cm AD/AB=EC/BC BC=16x18/6=48 cm
BE=BC-EC=48-18=30 cm
8
a) AB=18 cm;AC=36cm;AE=12 cm
AE/AB=AF/AC AF=AExAC/AB=12x36/18=24 cm
b) AC=16 cm; AF=6 cm; EB=5 cm
FC=16-6=10 cm
FC/AC=BE/AB AB=ACxBE/FC=16x5/10= 8 cm
c)AB=27 cm;AE=15 cm; FC=16 cm
BE=AB-AE=27-15=12 cm
BE/AB=FC/AC AC=AC=FCxAB/BE=16x27/1236 cm
d)AB=24 cm; EB=18 cm;FC=12cm
AE=AB-EB=24-18=6 cm
BE/AE=FC/AF AF=AExFC/BE=6x12/18=4 cm
