Question

Calculati in metri patrati aria unui dreptunghi cu dimensiunile:
13 dm si 300 cm;
300 m si 142 dam;
0,15 km si 0,13 hm;
123 mm si 12 cm.
Repede plz!

Answer 1

13dm =13 :10=1.3 m ;  300cm=300 :100 =3m
300m =300 m  ;142 dam =142 *10 =1420 m
0.15 km =0.15 *10^3 =0.15 *1000 =150 m ;0.13hm =0.13*10^2 =.13*100=13 m
123mm =123 :10^3=123:1000 =0.123m ;12cm =12 :10^2=12 :100=0.12m
  A = L * l
succes