| Answer | Crossword Clue |
|---|---|
| perimeter | the circuit or boundary of any plane figure |
| perimeters | PERIMETER, the circuit or boundary of any plane figure |
| circles | A round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center) |
| circle | A round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center) |
| trapezia | any rectilinear quadrilateral plane figure not a parallelogram; such a figure of which no two sides are parallel; such a figure having two parallel and two nonparallel sides |
