Answer:
a = 87.2 meters
Explanation:
Apply the Pythagorean Theorem here: a^2 + b^2 = c^2.
Let a represent the unknown "side that takes walkers to a court.
Let c represent the diagonal length and let b represent the side by the lake. Then b^2 + a^2 = c^2, or
180^2 + a^2 = 200^2, or
32400 + a^2 = 40000
Solving for a^2, we get a^2 = 7600, and from that we get a = 87.2 meters