If two lines intersect each other at right angles, that means that the measure of each angle between the two lines is 90o. Another way of stating this is to say that two lines are perpendicular.
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Adjacent angles are angles right next to each other
It has no right angles, so if that is what you mean, no, it is not.
Vertical Angles are a pair of nonadjacent anglesopposite each other formed when two lines cross.Vertical angles are two angles opposite of each other. Vertical angles will also always have equal angles.
If you mean the ratio of 2,4,6 then the angles are 30 degrees, 60 degrees and 90 degree which in effect is a right angle triangle.
Do you mean an octagon with ONLY 4 right angles? If you just need at least 4 right angles than you just need to make a block lettered capital "T"