Question

15 ,16 ,17 ,19 va roggggggg

Answer 1

15.  l+10m=p/2=2l
⇒l=10m
A=10^2m^2=100m^2

16. P=2(l+L), unde L=l+2
P=2*(l+l+2)=2(2l+2)=4l+4=28 m
4l=28-4=24m
l=24:4=6m
L=6+2=8m
A=6*8=48 m^2

17. P/2=l+L=15 m
10m+l=15 m, l=15-10=5m
A=5*10=50 m^2

19 . S= L+l=2l+2+l=28/2=14
3l+2=14
3l=14-2=12 m
l=12:3=4m
L=2*4+2=10 m
A=10*4=40 m^2