Question:
An equilateral triangle has a side of length 12 inches. What is the area of the triangle, in square inches? Express your answer in simplest radical form.

Answer:
The area of an equilateral triangle with side length $s$ is $s^2\sqrt{3}/4$. We have $s = 12$, so our area is $12^2\sqrt{3}/4 = \boxed{36\sqrt{3}}$.