Question

Why cant 6cm,9cm,3cm be a triangle

Answer 1

Bcoz the 2 sides 3 & 6 have sum 9 which is equal to the third side

But in a triangle the sum of two aides is always greater than the third side

Thus it cannot be a triangle

Answer 2

9 cm > 6 cm > 3 cm

(6+3) cm

= 9 cm

So, it can't be a triangle because, the sum of the smaller sides is not greater than the longest side.