Difference between revisions of "1978 AHSME Problems/Problem 7"

m (extra answer choice)
 
Line 4: Line 4:
 
<math>\textbf{(A) }7.5\qquad
 
<math>\textbf{(A) }7.5\qquad
 
\textbf{(B) }6\sqrt{2}\qquad
 
\textbf{(B) }6\sqrt{2}\qquad
\textbf{(C) }5\sqrt{2}\qquad
+
\textbf{(C) }5\sqrt{2}\qquad  
\textbf{(D) }\frac{9}{2}\sqrt{3}\qquad  
 
 
\textbf{(D) }\frac{9}{2}\sqrt{3}\qquad
 
\textbf{(D) }\frac{9}{2}\sqrt{3}\qquad
 
\textbf{(E) }4\sqrt{3}    </math>
 
\textbf{(E) }4\sqrt{3}    </math>

Latest revision as of 01:06, 22 February 2024

Problem 7

Opposite sides of a regular hexagon are $12$ inches apart. The length of each side, in inches, is

$\textbf{(A) }7.5\qquad \textbf{(B) }6\sqrt{2}\qquad \textbf{(C) }5\sqrt{2}\qquad  \textbf{(D) }\frac{9}{2}\sqrt{3}\qquad \textbf{(E) }4\sqrt{3}$


Solution

Draw a perpendicular through the midpoint of the line of length $12$ such that it passes through a vertex. We now have created $2$ $30-60-90$ triangles. Using the ratios, we get that the hypotenuse is $6 \times \frac {2}{\sqrt{3}}$ $= \frac {12}{\sqrt {3}}$ $= 4\sqrt{3} \rightarrow \boxed {\textbf{(E)}}$


See Also

1978 AHSME (ProblemsAnswer KeyResources)
Preceded by
Problem 6
Followed by
Problem 8
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
All AHSME Problems and Solutions

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