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) \( 25.800 \mathrm{~m}^{2} \)

Answer

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Answer

\( A = s^{2} = 80^{2} = 6400 \mathrm{~m}^{2} \)

Steps

Step 1 ：\( P = 4s = 320 \)

Step 2 ：\( s = \frac{320}{4} = 80 \)

Step 3 ：\( A = s^{2} = 80^{2} = 6400 \mathrm{~m}^{2} \)