Help with 2 math problems

Test Preparation ACT Preparation
1

<p>The two problems I need help with are from the math section in Preparing for act 2012-2013.</p>

<ol>
<li>The figure below consists of a square and 2 semicircle, with dimensions as shown. What is the outside perimeter, in centimeters, of the figure?</li>
</ol>

<p>I though I did this one right, but I guess not.</p>

<ol>
<li>What is the surface area, in square inches, of an 8-inch cube?</li>
</ol>

<p>I'm unsure of what formulas to use for this one.</p>

<p>link to the pdf is at Test</a> Prep | ACT Student or <a href="http://media.act.org/documents/preparing.pdf%5B/url%5D"&gt;http://media.act.org/documents/preparing.pdf&lt;/a&gt;&lt;/p>

<p>If someone could help me out it would be greatly appreciated :)</p>

2

<p>The horizontal sides of the square are 8 cm each so they total 16 cm. The two semi circles together have the perimeter as a full circle with the same radius (r=4) C=2rpi=8pi. So our answer is 16+8pi which is B</p>

<p>If each side of a cube has length 8 then the area of a side is 64. There are 6 sides of a cube so the total surface area is 64*6=384, which is G</p>

3

<p>Thank you!!</p>