at right angles to
Forming an angle of 90 degrees to something.
I was made at right angles to the world and I see it so. I can only see it so. Elizabeth Bishop
Time, so to say, runs at right angles to the page at each point on the curve. Joan Robinson
Any segment of a right-angled conoid (i.e., a paraboloid of revolution) cut off by a plane at right angles to the axis is 1½ times the cone which has the same base and the same axis as the segment. Archimedes
I'm probably borderline OCD. I insist on having all objects at right angles to each other. So a fork has to be at a right angle to the knife on the table. The salt and pepper pots have to be placed close together. Only recently have I started to notice it's a weird way to behave. Laura Haddock
If you direct your attention to the position of a bird with regard to the wave surface, it will speedily be noticed to be nearly always on the rising side or face of the wave and moving apparently at right angles to the wave's course, but really diagonal to it. Lawrence Hargrave