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The papers revealed that over the years Washington had misled the public about the reasons behind the Vietnam War
The perimeter of anything is found by adding all of the sides. So in the case of a pentagon it is the sum of the length of its five sides.
Sometimes. For a regular pentagon, all the sides and interior angles are congruent. However, this isn't the case for some pentagons.
The sum of the interior angles of a pentagon = (5-2)*180 = 540 degrees. IF the pentagon is regular, then each of its interior angle is the same. In that case, each will be 540/5 = 108 degrees.
Yes. A simple case would be where they combine into a square.