Question 193226
Since the area of a circle is {{{ A = pi*r^2 }}}, the area of a semi-circle is half that, or {{{ (pi*r^2) / 2 }}}.

In this case, the radius (r) of the semi-circle is 12 in.  Substituting in we get:
{{{ A = (pi * 12^2) / 2 }}} sq. in.

Simplifying gives us:

{{{ A = (144*pi / 2) }}} sq. in., or {{{ A = 72*pi }}} sq. in.

Substituting 3.14 in for {{{pi}}} gives us:

{{{ A = 226.08 }}} sq. in.

This is the window's area, in square inches.  Multiplying this by the laminate's price per square inch gives you a cost of:

226.08 * $0.75 = <font color="blue">$169.56</font>
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Hope this helps,
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~ Joe