Răspuns :
Lungimea=(12x10+3)/10=123/10 = 12,3 cm
Latimea = 2/3 x 123/10= 246/30 = 82/10=8,2 cm
Perimetrul=2(L+l)=2(12,3+8,2)=2 x 20,5= 41 cm
Latimea = 2/3 x 123/10= 246/30 = 82/10=8,2 cm
Perimetrul=2(L+l)=2(12,3+8,2)=2 x 20,5= 41 cm