Rachel needs 1776 inches of board
Solution:
Given that, Rachel is making a planter box
Her box measures 345 inches long and 543 inches wide
Length = 345 inches
Width = 543 inches
To find: Inches of board she needs
So we need to find the perimeter of the board
The board is usually of rectangular shape
Perimeter of rectangle is given as:
Perimeter = 2(length + width)
Perimeter = 2(345 + 543)
Perimeter = 2(888)
Perimeter = 1776
Thus she needs 1776 inches of board