Does ets have the wrong answer listed?

Graduate School
1

<p>Or am I smoking some crack?</p>

<p>[Question 1](<a href=“GRE General Test Quantitative Reasoning Overview”>http://www.ets.org/gre/revised_general/about/content/quantitative_reasoning&lt;/a&gt;), the answer should be C… right?</p>

<p>If the answer really is D, what am I missing?</p>

2

<p>non shaded area shown as 160 degree so the shaded area is only
(360-160-160) = 40 degree
therefore shaded area =
40/360 * pi * 6 * 6 = 4pi (D)
I think u did calculation error?</p>

<p>more explanation:

  • circle is 360 degree total
  • two intersecting lines will result same angle on sides behind it (160 on non shaded area, the other non shaded area is 160 making 320 degree total)
  • Therefore the shaded area angle total is 360-320 = 40 degree
  • total area of circle = pi * R^2 = pi *6 *6 = 36 pi
  • The shaded area = 36 pi * 40 / 360 = 40/10 * pi = 4pi</p>
3

<p>Ugh. So I was smoking some crack.<br>
I was doing:</p>

<p>2/160 <em>pi</em>6*6</p>

<p>instead of
2/180<em>pi</em>6*6.</p>

<p>Thanks for helping me. I feel dumb.</p>