Problem
52. What is the area of a circular enclosure that uses 312 meters of fencing? (a) \( 7746.4 \mathrm{~m}^{2} \) (b) \( 30,985.6 \mathrm{~m}^{2} \) (c) \( 6084 \mathrm{~m}^{2} \) (d) \( 305,815.2 \mathrm{~m}^{2} \)
Solution
Step 1 ：C = 312
Step 2 ：r = \(\frac{C}{2\pi}\)
Step 3 ：A = \(\pi r^2\)
