| SIZER | Ring ___ (tool that determines the circumference of a finger) |
| ARC | Referring to a curve, such as a section of the sun's apparent path or part of the circumference of a circle, one of a number of English words derived from the Latin for "bow" (3) |
| OCTANT | One-eighth of the circumference of a circle; or, a section of a compass rose (6) |
| RADIUS | From the Latin meaning "spoke", a straight line from the centre to the circumference of a circle (6) |
| QUADRANT | A quarter of the circumference of a circle (8) |
| RADII | Lines from the centre to the circumference of a circle (5) |
| SEAM | The external stitching along the circumference of a cricket ball (4) |
| EPICYCLE | A circle whose centre moves round the circumference of a larger one (8) |
| QUADRANTS | There are four in the circumference of a circle (9) |
| RATIO | Pi is one, between the circumference of a circle and its diameter |
| TWELVE | The circumference of a softball (in inches) is what? |
| DECIDER | Point, goal or game that determines the winner of a match (7) |
| WATERMETER | Device that determines the amount of a utility bill |
| GPA | Stat that determines the honor roll: Abbr. |
| RATES | Speeds that determine the scales of payment? (5) |
| RINGBARKING | Girdling, or the complete removal of a strip of bark from around the entire circumference of a tree branch or trunk (as used in forestry) (4-7) |
| ANTLERS | Stag's branched horns with points that determine the aforesaid animal's status as a royal, imperial, monarch etc (7) |
| ERATOSTHENES | Greek mathematician and astronomer who calculated the circumference of the earth by observing the angle of the sun's rays (12) |
| ORGYCHROMOSOME | Part of a genome that determines a person's love of wild parties? |
| RADIAL | Tyre in which the layers of fabric have their cords at right angles to the circumference of the tyre (6) |
