| A | B |
|---|
| INSCRIBED ANGLE | vERTEX ON CIRCLE AND SIDES ARE CHORDS |
| CENTRAL ANGLE | VERTEX IS CENTER AND SIDES ARE RADII |
| CIRCUMFERENCE | DISTANCE AROUND |
| ARC LENGTH | FRACTION OF CIRCUMFERENCE DEFINED BY ARC |
| CIRCLE | SET OF POINTS IN PLANE A GIVEN DISTANCE FROM A GIVEN POINT |
| RADIUS | SEGMENT FROM A POINT ON THE CIRCLE TO THE CENTER |
| CONGRUENT CIRCLES | CIRCLES WITH SAME RADIUS |
| CONCENTRIC CIRCLES | CIRCLES IN SAME PLANE WITH SAME CENTER |
| CHORD | SEGMENT WHOSE ENDPOINTS LIE ON A CIRCLE |
| DIAMETER | CHORD CONTAINING CENTER |
| SECANT | LINE THAT CONTAINS A CHORD |
| TANGENT | LINE IN PLANE OF CIRCLE INTERSECTING AT ONE POINT |
| ARC | CONTINUOUS PART OF CIRCLE BETWEEN TWO POINTS |
| SEMICIRCLE | ARC WHOSE ENDPOINTS ARE DIAMETER |
| MINOR ARC | ARC LESS THAN 180 DEGREES |
| MAJOR ARC | ARC GREATER THAN 180 DEGREES |
| PI | RELATION BETWEEN CIRCUMFERENCE AND DIAMETER |
| SUM OF CENTRAL ANGLES | THREE HUNDRED AND SIXTY DEGREES |
| INSCRIBED POLYGON | VERTICES LIE ON THE CIRCLE |
| INTERCEPTED ARC | ARC LYING BETWEEN SIDES OF INTERIOR ANGLE OF CIRCLE |
