1395 square units are the area of the regular octagon.
Regular octagon: An octagon in which all sides and angles are equal. Each angle of a regular octagon is 135°. Irregular octagon: An octagon in which all sides and all angles are not equal. Measures of angles of an irregular octagon are different but they all sum to 1080°.
In a regular octagon, all the sides are equal in length, and all the angles are equal in measure. The interior angles add up to 1080° and the exterior angles add up to 360°. The interior angle at each vertex of a regular octagon is 135°.
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