Question

Va rog frumos, amandoua subpunctele​

Answer 1

B U N Ă!

u-unitate de măsură

a) Perimetrul tr. ABC.

BC²=(xB-xC)²+(yB-yC)²

BC²=(-2-0)²+(0-4)²

BC²=(-2)²+(-4)²

BC²=4+16

BC²=20

BC=2√5u

AB²=(xA-xB)²+(yA-yB)²

AB²=25

AB=5u

AC²=(xA-xC)²+(yA-yC)²

AC²=25

AC=5u

P∆ABC=AB+AC+BC=5+5+2√5=(10+2√5)u

b) Aria triunghiului ABC.

Oy /_ Ox => CO/_AB => CO- înălțimea ∆ABC

CO=|4|=4 u

$A = \frac{l \times h}{2} = \frac{AB \times CO}{2} = \frac{5 \times 4}{2} = \frac{20}{2} = 10 {u}^{2}$

#Kawaiimath