Question 153869
Let x be the length of the shortest side.
Then the lengths of the other two sides are x + 4 and 2x.
The perimeter of the triangle is x + (x + 4) + 2x.
As the perimeter is 40, we have
x + (x + 4) + 2x = 40
Solving for x, we have
x+ x + 4 + 2x = 40
4x + 4 = 40
4x = 36
x = 9
So the length of the shortest side is 9 cm.
The lengths of the other two sides are:
x + 4 = 9 + 4 = 13 cm
2x = 2*9 = 18 cm