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No, there is no parabola shape on the arc. The legs are parallel lines connecting to the arch which is an half-circle.
The answer is 52.34
3.27 - 3.28 unitsr = L (360/θ) / 2 pi8 * (360/140) / 2 (3.1416) = about 3.27 units
You may have noticed a small sketch or drawing right next to the question, right there on the page where you copied it from. That little drawing or sketch is absolutely necessary in order to answer the question. There's no way to answer the question without it.
A better equation would be dE=dm*c2 showing that a change in mass is equivalent to a change in energy