Question

(FAN AND METAL) A horse is tied with rope in the center of grassland to graze. The length of the rope is 5m. The diameter of the circular garden is 50m. Find the area in which the horse CANNOT graze

Answer 1

So in order to find the area you have to take pi(r)^2 so for the first area it's pi(2.5)^2 (2.5 is half of 5. The radius is 1/2 of the diameter) an from that equation you would get 19.625 WHICH IS THE AREA OF THE SMALL CIRCLE (AKA where the cow can graze). So now we have to find the second circle using the same equation pi(r)^2 so it would be 3.14(25)^2= 1962.5 WHICH IS THE AREA OF THE BIG CIRCLE. Now take the area of the large minus the area of the small (1962.5-19.625=1942.875) which is the non-grazable area.

Note: to help memorize equations listen to this song, it will never go away but it's VERY helpful and has saved me MANY MANY times during tests. https://www.youtube.com/watch?v=lWDha0wqbcI