Question

Puteti rezolva asta?....

Answer 1

Răspuns:

p=30 cm

Explicație pas cu pas:

ABCD dreptunghi

MC=MD

MC= 6

MB = 10

ΔBCM avem unghiul BCM drept(90°)⇒BM²=BC²+MC²⇒BC²=BM²-MC²⇒

BC²=10²-6²⇒BC²=100-36⇒BC²=64⇒BC=√64⇒BC=8 cm

P=AB+BC+CD+DA

AB=DC

DC=MC*2

MC=6 cm

DA=BC

DC=MC*2

BC= 8 cm

⇒P=BC*2+MC*2*2⇒P=8*2+6*4⇒P=16+24⇒P=40

ΔABC↔ ∡ABC=90°

               AB=12 cm

               BC= 8 cm

⇒AC²=AB²+BC²⇒AC²=12²+8²⇒AC²=144+64⇒AC²=208⇒AC=√208⇒

⇒AC=4√13cm