Probability question?

<p>The question is on my Tumblr blog, Narcostic. The link is simple: Narcostic . tumblr . com
I couldn't type out the question, because it involves a picture.. Please help, this is not a virus or anything.. and remove the spaces between the periods in the link</p>

<p>What do you need help with? Basically, ignoring the alleged characterization of this question as a probability problem, you’re really just looking at areas. Essentially, the shaded area of this square (i.e. the triangle) is 1/5 of the entire area of the square. It is very obvious what the area of the square is, so multiply that by 1/5. Now you know the numerical value of the area. What is the area formula for a triangle? Plug, manipulate, and solve for “a.”</p>

<p>I figured it out, thanks! </p>