Răspuns:
Rezolvare:
a)AB=x-7=25,4-7=18,4(cm)
MD=18,4:2=9,2(cm) -- r
d=9,2 x 2= 18,4(cm)
b)Pfig=AB+BC+CD+ND+AM+1 pe 2 Lo = 18,4+25,4+18,4+9,2pi+7=62,2+7+9,2pi
Lo=2pi r=dpi=18,4pi(cm)
1 pe 2 Lo=9,2pi(cm)
AM+ND=25,4-18,4=7
c)Afig=AABCD -- 1 pe 2=467,36(cm²)
Ao=pir²=9,2²pi≈86,64·3,14≈266(cm²)
Afig≈467,37-133≈431,36(cm²)
