Question

Stabiliti daca punctele A,B C sint coliniare stiind ca :
b) AB=29 cm, AC=420mm,, BC=1,3dm
c)AB=4dm, AC=15mm, Bc=38,5 cm

Answer 1

AB=29 cm, AC=420mm=42 cm, BC=1,3 dm=13 cm 
29 cm +13 cm=42 cm ⇒ AB+BC=AC ⇒ A,B,C coliniare
A.....................B...........C
c) AB=4 dm=40 cm, AC=15 mm=1,5 cm , BC=38,5 cm
40 cm= 1,5 cm+ 38,5 cm ⇒ AB=AC+CB⇒ A,C,B coliniare (in aceasta ordine)
A....C..............................B