SOLUTION: What is the area in feet of circular tablecloth that has a diameter of 42 inches? A) 1385.44236 square feet B) 21 square feet C) 3.0625 square feet

Algebra ->  Angles -> SOLUTION: What is the area in feet of circular tablecloth that has a diameter of 42 inches? A) 1385.44236 square feet B) 21 square feet C) 3.0625 square feet       Log On


   

Question 203668: What is the area in feet of circular tablecloth that has a diameter of 42 inches?
A) 1385.44236 square feet B) 21 square feet C) 3.0625 square feet D) 1.75 square feet
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
The area of a circle is given by:
A+=+%28pi%29r%5E2 Replace r with D/2 since the problem gives you the diameter, D.
A+=+%28pi%29%28D%2F2%29%5E2 Substitute D = 42 inches.
A+=+%28pi%29%2842%2F2%29%5E2 Evaluate.
A+=+%28pi%29%2821%29%5E2
A+=+%28pi%29%28441%29
highlight%28A+=+1385.44236%29 sq.in. Now convert this to square feet by dividing by 144 sq.in. per sq.ft.
highlight_green%28A+=+9.6211%29sq.ft.
I just don't see this answer in your list of choices. Your answer A) has the right number but the wrong units, so answer A) would be correct if it were square inches. rather than square feet.