Question

Determinati inaltimea [CF] a unui triunghi ABC cu AB= 10 cm ai aria triunghiului ABC de 40 cm

Answer 1

Fie ΔABC oarecare
AB= 10cm

CF_|_ AB, F∈ [AB]

AΔ= $\frac{b*h}{2} = \frac{CF*AB}{2}$
40= $\frac{10CF}{2} = 5CF$
CF= 40:5= 8cm