An obtuse angle is an angle that is greater than 90 degrees and fans out. When used in a triangle, it makes all the other angles thin, or acute, and makes a very spread out kind of triangle. This is called an obtuse triangle.
(2/3) / 3 = 1/x...2/3 to 3 lawns = 1 to x lawns cross multiply (2/3)(x) = (3)(1) 2/3x = 3 x = 3 * 3/2 x = 9/2 or 4 1/2 lawns can be cut with a full tank of gas