Răspuns :
a) A= a*b=4*8=32 cm^2
b) A= (a*b)/2= (6*11)/2=33 cm^2
c) A= a*h=18*5= 90 cm^2
d) A= (d1*d2)/2=13*9/2=58.5 cm^2
b) A= (a*b)/2= (6*11)/2=33 cm^2
c) A= a*h=18*5= 90 cm^2
d) A= (d1*d2)/2=13*9/2=58.5 cm^2