| Rating | Solver | Clue |
|---|---|---|
| RIGHTANGLED | At 90° to | |
| RIGHT-ANGLED | At 90° to (5-6) | |
| PERPENDICULAR | A straight line at 90 degrees to a surface | |
| DIAMOND | The infield; the square space, 90 feet on a side, having the bases at its angles. | |
| QUADRANT | The quarter of a circle, or of the circumference of a circle, an arc of 90¡, or one subtending a right angle at the center. | |
| QUADRATURE | ...nother when distant from it 90¡, or a quarter of a circle, as the moon when at an equal distance from the points of conjunction and opposition.... | |
| COLURE | One of two great circles intersecting at right angles in the poles of the equator. One of them passes through the equinoctial points, and hence... | |