Question

I know the answer I just want to make sure I am right...
A carpenter proposes to make 4 triangular shelves of the following dimensions:

Shelf 1: 8 inches, 14 inches, 19 inches
Shelf 2: 10 inches, 16 inches, 25 inches
Shelf 3: 10 inches, 21 inches, 33 inches
Shelf 4: 7 inches, 20 inches, 30 inches

Which of the above shelf dimensions are not possible?
Shelf 1 and Shelf 2
Shelf 1 and Shelf 4
Shelf 2 and Shelf 3
Shelf 3 and Shelf 4

I think it is shelf 1 and 2! am i right?

Answer 1

a triangle is only possible if when you add two sides the sum is greater than the third side

Answer 2

shelf 1...add8 and 14 = 22 that's greater than the third side

8 + 19 > 14

19 + 14 > 8

therefore shelf 1 is a triangle

Answer 3

check each shelf with this kind of logic got it?

Answer 4

oh ok i got it all messed up..i was thinking that when you add the two sides the sum has to be less then the third side

Answer 5

haha =)) now you know

Answer 6

shelf 3 and 4, right?

Answer 7

yeps

Answer 8

you know why right?

Answer 9

alright thannx so much! yes because when i add both sides they were less than the third side..when they are really suppose to be bigger than the third side! ;)

Answer 10

you got best answer!

Answer 11

yups

Answer 12

i am the only answer lol =)

Answer 13

sure..if i know it

Answer 14

just post away

Answer 15

aww all geometry?

Answer 16

sorry..i really just hate geometry >.<

Answer 17

cant help sorry

Answer 18

no worries ;) thnx for your help!

Answer 19

most welcome ^_^ <tips hat>

Answer 20

which one would you like help with?

Answer 21

I will send you the links..just one minute!