Răspuns:
8. a) P= 2l+2L = 2*16+2*10= 32+20= 52 cm perim dreptunghi
b) M= (16+10):2= 26:2= 13
P=4*l= 13*4= 52 cm perim patrat
9. a)L=15 dm si l=2 supra 3 din L
b)l=10 hm si L=9 supra 5 din l
a) l= 2*15:3= 2*5 = 10 cm
P= 2l+2L= 2*10+ 2*15= 20+30= 50 cm
b) L= 9*10:5= 90:5= 18 hm
P= 2l+2L= 2*10+2*18= 20+36 =56 hm
10. a) l= 60*20:100= 1200:100= 12 cm
P= 2l+2L= 2*12+2*20= 24+40= 64 cm
b) L= 125*12 :100 = 1500:100= 15 dm
P= 2l+2L= 2*12+2*15= 24+30= 54 dm