Explanation
Radius, $$r=16\ ft$$
Central Angle, $$\theta = 270^o$$
Arc length $$=\dfrac{\theta}{360^o}\times 2 \pi r$$
$$=$$ $$\dfrac{270^o}{360^o}\times 2 \times \pi \times 16$$
$$=$$ $$75.4\ ft$$
Therefore, the length of the given arc is $$75.4\ ft.$$
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