none
None - the edge is curved so no straight sections to make angles
Two.
45 degree and a 90 degree angles
It is to bisect an angle into equal angles usually done with a pair of compasses and a straight edge
Any angle can be bisected using a compass and a straight edge.
No. Left aligned has a straight leftedge, Right aligned has a straight right edge, Justified has both left and right edges straight.
Anything that has a straight (180 degree) edge. Like a computer screen has 4 straight angles. Or the margin on a piece of paper, that's a straight angle too.
A perpendicular edge is a side of a plane shape that is at right angles (90 degrees) to another edge.
No. But there are straight edge "groups" that are a lot like gangs. But no, straight edge itself is not a gang, and a straight edge person is not a gang member.
A straight edge is used for making perfectly straight lines when drawing. The straight edge is placed on the paper and you use the edge to draw against.
A straight edge
Infinitely many. At any of the infinitely many points along any edge, the angle between the two faces meeting at that edge is a right angle.