Răspuns:
1,adevarat
2 asemenea
3.congruente
4, congruente
5m<E=78°=>m<B=78°
m<D=70°=>m<A=70°=>
m<ACB=m<C=180-(78+70)=
180-148=32°
6.P.ΔABC/PΔMNP=2/5
P,ΔABC/35=2/5
P.ΔABC=2/5*35=2*7=15cm
7ΔABC≈ΔDEF
P.ΔABC/PΔDEF=(13+11+12)/24=36/24=3/2=>
BC/EF=3/2
12/EF=3/2=>
3EF=2*12
3EF=24
EF=24/3=8 cm
8.(1/3)²=1/9
9.(1/2)²=1/4
Explicație pas cu pas: