Răspuns :
20000cm patrati ,180010 cm patrati 1,5 cm patrati 1200201000 cm patrati
200x2=400
18001x2=36002
15x2=30
1200201x2=2400402
2400402+400+36002+30=2436834
18001x2=36002
15x2=30
1200201x2=2400402
2400402+400+36002+30=2436834