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A polygon is a closed 2-dimensional shape whose boundaries are straight lines. The area within these boundaries in the interior and the area outside them is the exterior.
Approximately 2% of the total surface area of Britain is covered by roads.
sole / that is the part that actually makes contact with the pavement
Yes.
The area of a sector is the area of the circle multiplied by the fraction of the circle covered by that sector. This is a true statement and correct formula.