Which set of numbers does not create a triangle?

115 cm, 65 cm, 1.5 m

5 m, 9 m, 1500 cm

12.5 ft, 3 yd, 19.75 ft

6 yd, 33 ft, 15 yd

Question

Which set of numbers does not create a triangle?

 115 cm, 65 cm, 1.5 m

 5 m, 9 m, 1500 cm

 12.5 ft, 3 yd, 19.75 ft

 6 yd, 33 ft, 15 yd

anonymous · Answer

Oh I remember like there is a rule that the addition of two lengths can not be longer or shorter than the last side.

anonymous · Answer

I keep forgetting if it's shorter or longer though

anonymous · Answer

I think longer.

cwrw238 · Answer

the sum of any 2 sides must be greater than the other side

anonymous · Answer

Oh yeah !! thanks @cwrw238

anonymous · Answer

so will it be the last choice

cwrw238 · Answer

convert each option to same unit:

115 65 150 cm

5 9 15 m

12.5 9  19.75 ft

6  11 15 yd

anonymous · Answer

Thanks What About This Question 

What is the order of the side lengths of triangle ABC from largest to smallest?

 c, b, a

 b, a, c

 c, a, b

 b, c, a

cwrw238 · Answer

second one looks suspicious  right?

anonymous · Answer

yess it does but i think its the last option 6 yd, 33 ft, 15 yd

cwrw238 · Answer

no - not that one - 2 are in yes and 1 in ft
33 ft = 11 yds
- so that one is triangle

cwrw238 · Answer

* 2 in yards 1 in feet

cwrw238 · Answer

you can't compare properly unless they are all in same units

anonymous · Answer

so it has to be  115 cm, 65 cm, 1.5 m

cwrw238 · Answer

no - its  5m 9m 1500cms

this is same as 5m 9m 15m     

5m + 9m = 14m  which is less than 15m so no triangle with these lengths

cwrw238 · Answer

second option cannot be a triangle

anonymous · Answer

which one do you think it is

cwrw238 · Answer

follow?

as for second question - the longest side is opposite the greatest angle

cwrw238 · Answer

it is the 5m 9m 1500cm triangle

cwrw238 · Answer

- though its not a triangle - lol!!

cwrw238 · Answer

seriously - do u understand why thats the answer?

anonymous · Answer

YES the rule makes a little sense

anonymous · Answer

so will it be b,a,c ?

cwrw238 · Answer

yes

anonymous · Answer

For a triangle with sides a = 15 and b = 8, side c must be less than what length? Type the numeric answer only in the box below.

Numerical Answers Expected!

cwrw238 · Answer

b is opposite largest angle, 80 degrees
c is opposite smallest 31

cwrw238 · Answer

c must be lass than 15 + 8

anonymous · Answer

will that be the Numerical Answers c must be lass than 15 + 8