Question

Which three lengths cannot be the lengths of the sides of a triangle? (1 point)

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

Answer 1

For three lengths two be able to be the sides of a triangle, the longest side must be less than the sum of the two other sides.

A.
25 is the longest side.
16+10=26
25<26

It is possible.

B.
15 is the longest side.
13+12=25
15<25

It is possible.

C.
18 is the longest side.
5+10=15
18 is NOT less than 15.

It is not possible.

D.
15 is the longest side.
8+8=16
15<16

It is possible.

Therefore, the answer is c.

Hope this helps!