Răspuns :
A-B-C⇒sunt puncte coliniare in aceasta ordine[se afla pe aceeasi dreapta];
⇒AB=1,5dm=15cm;
⇒AC=240mm=24cm;
⇒BC=AC-AB
⇒BC=24cm-15cm
⇒BC=9cm;
⇒AB=1,5dm=15cm;
⇒AC=240mm=24cm;
⇒BC=AC-AB
⇒BC=24cm-15cm
⇒BC=9cm;
Bc=24-15
BC=9cm.........................................................
BC=9cm.........................................................