Posted by brianna on .
Jeff is building triangles with different lengths of cm rods. He has two rods measuring 6cm and 9cm. Which of the following would not form a triangle if laid them end to end? 3cm,5cm,6cm or 9cm?

math 
bobpursley,
3cm. 6cm+3cm just equal the third side, 9cm, making aline, not a triangle.