Question

Va rog ajuati-ma la ex 2.

Answer 1

a)
Adisc=πr²=π×(3√5)²=45π =45×3,14=141,3 m²


b) OA=OB=a
    AD=BC=2a
r=OC=√[a²+(2a)²]=√5a²=a√5
3√5=a√5    ⇒a=3    ⇒latura patratului= 2×3=6 m

c)
Ap=6²=36 m²
Asemidisc=Adisc :2=141,3:2=70,65 m²
Ap/Asemidisc=36/70,65=3600/7065=80/157
80/157=0,50955=50,96%