SAT Math Question (With link to 2009 released)

Test Preparation SAT Preparation
1

<p>Could someone help me with the following question please?</p>

<p>Page 65 (Section 6, Question 5). The question is as follows:</p>

<ol>
<li>In the figure above, triangle ABC is inscribed in the
circle with center O and diameter AC. If AB = AO, what is the degree measure of angle ABO?
(A) 15°
(B) 30°
(C) 45°
(D) 60°
(E) 90°</li>
</ol>

<p>And the picture that goes along with it can be found on the following link.
<a href="http://www.collegeboard.com/prod_downloads/sat/sat-preparation-booklet.pdf%5B/url%5D"&gt;http://www.collegeboard.com/prod_downloads/sat/sat-preparation-booklet.pdf&lt;/a&gt;&lt;/p>

<p>Thanks :)</p>

2

<p>Is it just because the triangle is an isosceles?</p>

3

<p>its 60 cause its an equilateral triangle. Since AO and BO are the radii and AB = AO that means AB = AO = BO which is only possible if all angles are 60.</p>

4

<p>wow this is so easy just look at it. Radius = radius = other length so 60.</p>

5

<p>Ah okay, that was me being dumb. Thanks. I didn’t realize that it was equilateral.</p>