Mathcounts Marathon - Page 5 - XP Math - Forums

 XP Math - Forums Mathcounts Marathon

 08-15-2007 #41 Temperal Guest   Posts: n/a Arghh! Okay, Precalc coming up. Heh heh.... A man wants to build a rectangular enclosure for his herd. He only has \$900 to spend on the fence and wants the largest size for his money. He plans to build the pen along the river on his property, so he does not have to put a fence on that side. The side of the fence parallel to the fence will cost \$5 per foot to build, whereas the sides perpendicular to the river will cost \$3 per foot. What dimensions should he choose? EDIT: There's a reason why it's called MATHCOUNTS Marathon. Last edited by Sillysidley; 08-15-2007 at 09:43 PM..
 08-15-2007 #42 Sillysidley   Join Date: Oct 2006 Posts: 822 Mathcounts only Well, I guess we could do some easy algebra, geometry, and counting. So only post easy-moderate problems of those type Skipping the so-called precalc question: If a square in a semicircle of radius r has area 8,find the area of a square in a circle of radius r. Would've helped this year at state __________________ .
 08-15-2007 #43 Temperal Guest   Posts: n/a Eh, I don't want to solve it now (it's very late in my time zone), so I'll just give the technique, and post the answer later. Divide square into two rectangles, use area of square, diagonals of rectangles (which are the radii of the semicircle) to find relationships between numbers, apply to full circle using the fact that full circle square's diagonal is diameter, done. Easy. I wanna start an Olympiad or AIME topic!
 08-15-2007 #44 Sillysidley   Join Date: Oct 2006 Posts: 822 Yeah, we can so start an AIME topic. Or how about we start an AMC 10 or 12 topic right now, and later, when we're all sure we'll make AIME (around november or december) we make an AIME topic? __________________ .
 08-18-2007 #45 Temperal Guest   Posts: n/a Okay. Next problem?
 08-19-2007 #46 Sillysidley   Join Date: Oct 2006 Posts: 822 Give an answer to my problem first __________________ .
 08-20-2007 #47 Temperal Guest   Posts: n/a Oh come on. If I known how to, do I really have to actually do it?! (aka I'm lazy)
 08-20-2007 #48 Sillysidley   Join Date: Oct 2006 Posts: 822 Yup __________________ .
 08-21-2007 #49 Temperal Guest   Posts: n/a Posted on AoPS to save myself the trouble.
 08-22-2007 #50 Sillysidley   Join Date: Oct 2006 Posts: 822 You did? __________________ .

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