Question

If two sides of a triangle measure 12 and 7, which cannot be the perimeter of the triangle?

Answer 1

Hi,
Let assume x the 3th side.
x<12+7==> x<19
12<x+7==>x>5
So 5<x<19==> 5+7+12<x+7+12<19+7+12
==>24<x<38
Answer d.