Problem
Chapter 10 51. What is the area of a square enclosure that uses 320 meters of fencing? (a) \( 1280 \mathrm{~m}^{2} \) (b) \( 6400 \mathrm{~m}^{2} \) (c) \( 9400 \mathrm{~m}^{2} \) (d) \( 25.800 \mathrm{~m}^{2} \)
Solution
Step 1 ：\( P = 4s = 320 \)
Step 2 ：\( s = \frac{320}{4} = 80 \)
Step 3 ：\( A = s^{2} = 80^{2} = 6400 \mathrm{~m}^{2} \)
