Find the value of g

-g + 6 + 1/2g - 9 = 7 1/2

The value of g is -21

To find the perimeter of a 2D figure, you add up the lengths of all the sides. In this case, the figure is a square, a polygon that has all equal sides. So, you know that every side on the square is 25 cm long.

25 + 25 + 25 + 25 = 100

So, your answer is 100 cm of lace.