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A square with a rounded corner. =)
An exterior angle is on the outside of a shape. For example, the internal angle of a corner of a square is 90 degrees. 360 degrees less 90 degrees equals 270 degrees. Therefore, the exterior angle of a right-angle is 270 degrees. Search Google with "exterior angle" for more info.
Drafting - is preparing an initial copy of a document.
A T-Square is a drafting tool for drawing straight horizontal and vertical lines, relative to the edge of the drafting board.
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