Posted by **Jessie** on Thursday, December 6, 2012 at 5:41pm.

Which three lengths cannot be the lengths of the sides of a triangle?

A)25 m, 16 m, 10 m

B)15 m, 13 m, 12 m

C)18 m, 5 m, 10 m

D)8 m, 8 m, 15 m

- Geometry -
**Reiny**, Thursday, December 6, 2012 at 7:07pm
to form a triangle , the sum of any two lengths must be greater than the third length.

Look at C)

18+5> 10 ? , yes

18 + 10 > 5 ? , yes

5+10 > 18 ? , NO

the 3 sides cannot form a triangle

test the others the same way

- Geometry -
**A. Nony Mous**, Friday, December 7, 2012 at 11:22am
thanks so much!!! it worked. all are bigger than the third length except for c. :)

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