SOLUTION: Flying Disc. A plastic flyiing disc is circular and has a circular hole in the middle. If the diameter of the outer edge of the ring is 13 inches and the diameter of the inner ed

Algebra ->  Formulas -> SOLUTION: Flying Disc. A plastic flyiing disc is circular and has a circular hole in the middle. If the diameter of the outer edge of the ring is 13 inches and the diameter of the inner ed      Log On


   

Question 68312This question is from textbook Geometry
: Flying Disc. A plastic flyiing disc is circular and has a circular hole in the middle. If the diameter of the outer edge of the ring is 13 inches and the diameter of the inner edge of the ring is 10 inches, what's the area of plastic in the ring? Use 3.14. This question is from textbook Geometry

Answer by ptaylor(2198) About Me  (Show Source):
You can put this solution on YOUR website!
Area of a circle=(pi)r^2=%283.14%29%28r%5E2%29
Area of the plastic=area of large disc - area of small disc
radius of large disc=13/2 inches
radius of small disc=10/2=5 inches
Area of large disc=3.14%2813%2F2%29%5E2
Area of small disc=3.14%285%29%5E2
Area of the plastic=3.14%2813%2F2%29%5E2-%283.14%29%285%29%5E2
Area of the plastic=3.14%28169%2F4%29-3.14%2825%29
Area of the plastic=132.665-78.5
Area of the plastic=132.665-78.5=54.165 sq inches-----------------answer
Hope this helps---ptaylor