Basic College Mathematics (10th Edition)

The figure name is a square. The perimeter is $72$ mm and the area is $324$ mm$^{2}$
1. State the figures name: Square, since all sides have equal lengths. 2. Find the perimeter of the square Let $P =$ the perimeter of the square $P = 4(18)$ $P = 72$ mm 3. Find the area of the square Let $A =$ the area of the square $A = 18 \times 18$ $A = 324$ mm$^{2}$