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1

<p>Section 6, #15</p>

<ol>
<li>The area of the figure above is 9/4
What is the
perimeter of the figure? </li>
</ol>

<p><a href="https://satonlinecourse.collegeboard.org/SR/digital_assets/assessment/pdf/F4D31AB0-66B4-CE32-00F7-F5405701F413-F.pdf%5B/url%5D"&gt;https://satonlinecourse.collegeboard.org/SR/digital_assets/assessment/pdf/F4D31AB0-66B4-CE32-00F7-F5405701F413-F.pdf&lt;/a&gt;&lt;/p>

2

<p>I got the perimeter is 4</p>

3

<p>4 is not the answer.</p>

<p>For starters, identify two squares of 1 x 1 on the figure by drawing some lines. Then realize that the two squares’ area is 1 + 1 or 2. An area of 9/4 would need an “added” 1/4. By deduction, you now know that the protruding part is a 1/4 by 1 rectangle, and that the right side of the figure must be 1.25. </p>

<p>From there, you can complete the problem quite easily.</p>

4

<p>Thanks xiggi</p>

<p>Another question, Section 9 #13:
In the figure above, A||m Which of the following
must equal 180 ?
(A) k + n + r
(B) k + p + s
(C) n + p + s
(D) n + p + t
(E) r + s + t</p>

<p><a href=“SAT Practice and Preparation – SAT Suite | College Board”>SAT Practice and Preparation – SAT Suite | College Board;

5

<p>What can you say about n and s? Could you replace n with s in the triangle?</p>

6

<p>The answer I got was 5 3/2</p>

<p>The left side of the figure is obviously a square that is 1x1. So it’s area is 1 and we can cross it off. What’s left is a rectangle with a length of 1, but we don’t know the width. However, because the square is 1, 9/4 - 1 = 5/4. Therefore, the width must be 5/4 to make the rectangle’s area 5/4. Thus, the tiny little part that comes out must be 1/4 because 5/4 - 1 is 1/4. Thus the perimeter is 1+2+1/4+1+1+5/4 = 5 3/2</p>

7

<p>^^</p>

<p>5 3/2 is NOT a SAT answer! 5 3/2 is none other than 6 1/2. Be very careful when expressing fractions. It is always better to leave them in their simplest form. For instance 6 1/2 is better written as 13/2.</p>

8

<p>^Oh wow that was stupid of me. LOL it’s like a partially mixed fraction.
Sorry, 13/2</p>

9

<p>To all … make sure to read the stickied threads. The official practice tests are often repeated. </p>

<p>This link will help finding the answers:</p>

<p><a href=“SAT Practice and Preparation – SAT Suite | College Board”>SAT Practice and Preparation – SAT Suite | College Board;

10

<p>How would you be able to replace n with s in the triangle?</p>