Answer:
To solve this problem, we can use the Pythagorean theorem, which states that for any right triangle with legs of length a and b and hypotenuse of length c, a² + b² = c².
We are given that one of the legs has a length of 21 yds, and the area of the park is 294 yd². We can use the area formula for a right triangle to find the length of the other leg:
area = 1/2 * base * height
294 = 1/2 * 21 * height
294 = 10.5 * height
height = 28
So the other leg has a length of 28 yds. Now we can use the Pythagorean theorem to find the length of the hypotenuse:
c² = a² + b²
c² = 21² + 28²
c² = 441 + 784
c² = 1225
c = √1225
c = 35
Therefore, the length of the path along the longest side of the park would be 35 yds