How does the line trough turn 90 degrees?
The easiest way to align two lines is to draw a straight line straight line and then diagonal cut.
Horizontal groove and the vertical groove is divided by 45 degrees angle, after the alignment is 90 degrees angle.
1: The tube can be bent at a straight angle of 90 degrees with a bend spring or with a 90 degree elbow. 2: trunking are generally two trunks each cut 45 degrees angle to form a 90 degree vertical angle, if the horizontal 90 degrees, the direct groove on the groove, the trough cover on the fold that is good.
