a) A ΔABC= AB*AC:2= 12*16 :2= 96 m²
Δ ABC dr ⇒ T Pit⇒ BC² = AB²+AC²= 12²+16²= 144+256=400
⇒ BC=√400= 20 m
Daca BM= 6m, MN=4 m⇒ NC=20-10= 10m
P ABC= AB+AC+BC= 12+16+20=48 m
b) fie Δ ABC drept⇒ H= AB*AC:BC= 12*16:20= 9,6 m
A ABM= H* BM:2= 9,6 *6:2=28,8 m²
A ABM= d(M,AB)*AB:2
28,8= d(M,AB)*12:2
d(M,AB)= 28,8:6=4,8 m
c) A zambile= A AMN= H*MN:2= 9,6*4:2= 19,2 m²
A totala= 96m²
19,2= x% *96
x%=19,2:96=0,2
x= 20%