<p>I couldn't get why choice C was incorrect for Q 3 page 839.</p>
<p>could any1 explain pls?</p>
<p>ThanQ =]</p>
<p>Ruby, may I recommend to be more explicit in writing your question, and most importantly, to leave the “dewdspeak” out of this forum. </p>
<p>Trust me, it does not take much longer to write full words as opposed to "ur, pls, any1, or other moronic expressions such as ThanQ. </p>
<p>Why would anyone spend time helping if you do not think it is worth spending a few seconds on posting a clear message.</p>
<p>Page 839 of what?</p>
<p>Xiggi, I am sorry if writing in that way is not preferable around here and I’ll take your recommendation as an (advice) to help me improve my writing as I am taking the SAT for the first time in a month from now. </p>
<p>here is a better version of what was written in post #1 if it will work:</p>
<ul>
<li>need your help with { Question.3 Page 839 of the Blue Book } please… I couldn’t get it!!! ='(</li>
</ul>
<p>I couldn’t get why choice C was incorrect for Question 3 page 839 of the Blue Book.</p>
<p>could anyone explain please?</p>
<p>Thank you =] *</p>
<p>Silverturtle, Page 839 of the Blue Book. Sorry I just forgot to mention what the book was =</p>
<p>Circumference = C = 2<em>pi</em>r
Let C1 = Circumference of the circle with center A
Let C2 = Circumference of the circle with center C</p>
<p>C1 = 2C2 (as given in the problem)
2<em>pi</em>r1 = 4<em>pi</em>r2
r1=2r2</p>
<p>one radius is 2x the other radius…</p>
<p>AC = 6 = r1 + r2 (sum of both radii)</p>
<p>4 and 2 add up to 6 and one is 2x the other</p>
<p>answer is (B) 2, not (C) 4 because the question is asking for the length of the line segment that is the radius of the circle with a smaller circumference</p>