Geometry

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

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  1. 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

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  2. thanks so much!!! it worked. all are bigger than the third length except for c. :)

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