The angle dimension plug-in function can automatically generate an angle dimension by determining two endpoints and one vertex of the angle. The tab key (ALT key under MAC system) can switch the dimension's inside (less than 180 degrees) and outside (more than 180 degrees).
Angular Dimension（Angular Dimension）动画教程
Determine two endpoints and one vertex of the angle to automatically generate angular dimensions. Use the TAB key (ALT key under Mac system) to switch the inside and outside corners of the dimension.
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