a) Maritmetica = [tex] \frac{a+b+c+d}{4} [/tex] = [tex] \frac{74}{4} = 18,5[/tex]
b) P= 4l
32=4l
l = 32/4
l= 8
Triunghiul ABD drept . isoscel cu catetele laturile partratului (8 cm) => A = [tex] \frac{c1*c2}{2} = \frac{8*8}{2} = \frac{64}{2} = 32[/tex]
c) (√5-√2)²-(√5+√2)²+√160. = 5-2√10-2-5-2√10+2+4√10= 0