Ring Topology is least affected by addition or removal of nodes
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if a quadrilateral has three right angles will also have have a fourth right angle. Making it a rectangle. The addition of all the angles in a triangle is 360 degrees. If there are three right angles, and you subtract their addition by 360, you will get ninty degrees.
4 is the least number of edgers
A trapezoid has at least one pair.
how do you draw a quadrangle that has at least 1 right angle.