Question

if two sides of triangle is 4cm and 2.5cm then the length of the third side can not be___________.
$a)6cm \\ b)1.5cm \\ c)2cm \\ d)3.7cm$

Answer 1

as the sum of two sides of  triangle is ever greater than the third one and  their difference is ever smaller then the third side...

now 4+ 2.5 > third side

and, 4 - 2.5 < third side

    6.5> 3rd side > 1.5

that's why  1.5 can never be the third side,....