SOLUTION: Marty has a circular irrigation system. A single sprinkler is placed in the center of his square field. If the sprinkler sprays water just to the four edges of the field, what perc

Question 361205: Marty has a circular irrigation system. A single sprinkler is placed in the center of his square field. If the sprinkler sprays water just to the four edges of the field, what percent of the field is not watered?
if r = 1 the square is 4
the circle is pie
4 - pie
_______ = 100 = 21.46 %
4
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
If r=1 the square is 2 by 2 = 4 sq units
--------
The area of the circle = = pi units
The unwatered part is:
4 - pi sq units
=~ 0.86 sq units.
0.86/4 = 0.215
=~ 21.5%
Your answer is correct, and it's the same %age for any size square.
-------------------
PS It's pi, the Greek letter, not pie, the dessert.

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