which is not side of a rectangle?1.(2m,3m,4m)2.(3m,4m,7m)3.(3m,5m,9m)?

Question

give reasons

Answer 1

I don't know how these could be the sides of a rectangle since rectangles have two dimensions, not 3. And if you mean a rectangular prism (box) none of these are invalid as dimensions.

I think you mean triangle and the answers are 3,4 and 7 as well as 3,5 and 9 because that would result in triangles with no area.

The sum of the shorter sides should always be more than the third side. The only one that meets those criteria is #1.

#1: 2+3 > 5 --> good triangle
#2: 3+4 = 7 --> bad triangle (flat)
#3: 3+5 < 9 --> bad triangle (impossible)

So #2 and #3 are not the sides of a valid triangle.

Answer 2

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Answer 3

Navin, are those are lengths? If so, any of them could be the sides of a rectangle, depending on the other sides. Do you have any more information?