<p>I have to ask.. would it make sense for ACT to make a question like this, put two answers, one of which is the use of the diameter of the stump and one of which is the use of radii, and pick the one with diameters after not labeling values? Not to mention..when has anyone ever seen a formula that uses diameters instead of radii?</p>
<p>the thing I am arguing is that R and r did not equal radius...they labeled them in the drawing and all u had 2 do was plug them in...im prolly wrong only a couple of ppl agree with me and none of them r posting lol</p>
<p>i agree with u^</p>
<p>Thank you.....my point is that R and r were not radii but just variables that were used to label the picture</p>
<p>no, you don't understand. R and r are radiuses, not diameters. What you are doing is finding the area of circles in the shape of a tree stump. Picture it as something like finding the average area of a circle and multiplying it by the height. That is why they are the radius, not the diameter. The only time you ever use the diameter is for the circumfrence.</p>
<p>ok maybe u saw something that i did not see but they never said R and r were radii....they were just variables i think they used R and r to trick ppl into thinking they represented Radii....all u had 2 do was plug them in to the equation they gave u</p>
<p>but seriously though i think we both need 2 move on with that question....im not going to change my mind and either r u</p>
<p>R and r are symbolic of radius. on the picture before they show u an example of how the formula is applied. like there is a picture without a stump that says that the radius of the top circle is = R (for the small or big) but we know that R is the radius. i am positive that all you ahve to do is divide what is given on the picture by 2 and plug it into the equation.</p>
<p>if they already said R and r are the radius then why would you need 2 divide by 2?....you would divide by two if it were the diameter wouldnt you??</p>
<p>i've read to page 4 and i still didn't see my question..... so i must have had a brain fart if nobody else was confused by that same math question....</p>
<p>anways..</p>
<p>what was the 12?/3? </p>
<p>where the ? means that it is teh product of all teh lower even numbers.</p>
<p>so it should have been (12x10x8x6x4x2)/ (3x2) = 443520</p>
<p>but that isn't any of teh answer chioces....</p>
<p>did i do it wrong?</p>
<ol>
<li><p>Was the one where you had to identify the equation with a circle, (x-5) + (y-5) = 4? Or did the equation equal 16 instead of 4?</p></li>
<li><p>The one with the circle and tangent lines, were only the tangent lines (L and M) parallel?</p></li>
<li><p>The one where they gave you a circle, a degree measure, and a minor arc...was the degree measure Pi? I tried to solve this by using tangent, but I could only get a number close to Pi, not Pi.</p></li>
</ol>
<p>Wow, looks like I really should have studied Geometry =.</p>
<p>soyeahiknow, I did it this way:</p>
<p>(12x10x8x6x4x2)/ 3</p>
<p>I don't think you multiply the 3 by 2 for the denominator. I don't remember why, but what I ended up with WAS one of the answer choices.</p>
<p>i dont remember how i did it...but i wasnt worried about this question</p>
<p>i got 1,920 for this answer i think but dont remember how...cant believe i remember that...im not totally sure tho, my memory is fuzzy</p>
<p>"(12x10x8x6x4x2)/ 3"</p>
<p>-isnt it evens only...no odds?</p>
<p>i think its only everything after the number......(10x8x6x4x2)/(2)=1,920....im not sure if thats right but i remember it was an answer choice</p>
<p>(12x10x8x6x4x2)/ (3x2) = 443520</p>
<p>thats wrong...that equals 7680</p>
<p>Math was so hard this time around that I hope 10 wrong would be like 32 =</p>
<p>does 1,920 sound right to anyone?</p>
<p>(1,1,0,0)</p>
<p>does anyone remember if this was choice E?</p>