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A2 - geometry systems 9

Added Apr 03, 2014 •

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notes on April 3/4 part 3 of 3

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Pfeiffer number 9 basically the thing to pay attention to this part right here is just kind of getting me to think about how to get that shaded area and basically ideas for if you find the Shaded area you need to find the area of the circle and find the area of the square and subtract them but you're told here that the Shaded area needs to be 185  but the diameter must be four times as big as the side length of the square so there's our two equations so to get to the Shaded part  well basically while I'm have to do to get the area of the circle and subtract it from the area of the square false air of a circle does pi r squared an area of a square is the side length squared so as far as the circle is concerned  you know the diameter is why so my radius to be huh Hawaii what's up substitute we know the areas supposed to be 185 but the circle actually be High Times quad / 2 square  minus my styling squared which is x x x so minus x squared  so there's my first equation to get my second equation notice that you're told that the diameter must be four times as big as a side length of the square so whatever my diameter is I'm at The X 4 my side length of my square by 4 to get my side  so the bottom equations ready to go for second one was talked about cleaning that up  so we're sitting at 185 pod X Y / 2 squared minus  expert going to clean this up I get pi x y squared 4 minus x squared equals 185 address for Dubose size  image 185 plus x squared people's party for X Y squared  remote for everything by 4 / Pi Swissport cancel in the pod  so when you get y squared equals 4 / 5 * 185 + x squared now to get by myself with take the square root  so we get y equals 4 over 5  x 1/8 five contact Square  and ask word of all of that  cuz I mouthful but you probably get all in attack on anyway so no big deal  Sanders grassbow fines and find out where they intersect keep in mind with talking about side lengths so we're only looking for  pawsitive