The x intercept is the amount of money she has and I don't know what it is.... sorry. I knew what it stood for though.
Take the length of one of the sides and times that by the radius. Divide that answer by 2. Now take that and multiply by the number of sides the polygon has. If you can't find the radius or side, you're going to have to use tan, sin, or cos.
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If the triangle has a right angle, the measure of the third side is 12.8 inches
