Perimeter of triangle is adding all three sides.
For example a triangle with sides 3, 5, and 7 would have a perimeter of 15
Now we use your values.
632 = (x) + (3x) + (3x + 2)
632 = 7X + 2
630 = 7x
90 = X
So side 1 is 90
Side 2 is 3(90) or 270
Side 3 is 3(90) + 2 or 272
Add all those up and you get (you guessed it) 632
