0Răspuns:
Explicație pas cu pas:
1) 180°
2)isoscel
3)60°
4)P=3+3+6=12 cm
5) P=3l=24 l=8cm
6)∡ABC=(180°-36°)/2=72°
II
1. Pabd=AB+AD+BD
Padc=AC+AD+DC
.........................................
2Pabd=AB+AC+BC+2AD 2Pabd=Pabc+2AD
2×12=Pabc+2x4 24=Pabc+8 Pabc=16 Rasp B
2.
∠A=180°-(75°+α/2)
∠A=180°-2α 75+α/2=2α 2α-α/2=75 3α/2=75 α=50°
∡A=180°-100°=80° Raspuns A
3.x/1/5=y/1/2=z/1/5=)x+y+z)/(1/5+1/2+1/5)=36/9/10=40
x=40×1/5=8 =z
y=40/2=20 Raspuns C
4 ∡B=∡C=90°/2=45° Rspuns C
