Posted by Laurena on Wednesday, July 25, 2012 at 8:08pm.
You're looking at a right-angle triangle. Use the Pythagorean Theorem.
a^2 + b^2 = c^2
a^2 + 9^2 = 12^2
a^2 + 81 = 144
a^2 = 63
a = 7.94 meters
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