Across
- 4. declare invalid (an official agreement, decision, or result).
- 5. the enclosing boundary of a curved geometric figure, especially a circle.
- 6. a straight line passing from side to side through the center of a body or figure, especially a circle or sphere
- 7. a line segment that joins two points on the circumference of a circle.
- 9. Central angles are subtended by an arc between those two points, and the arc length is the central angle of a circle of radius one.
- 10. in geometry, an inscribed angle is the angle formed in the interior of a circle when two secant lines intersect on the circle.
- 11. a group of (typically three or more) notes sounded together, as a basis of harmony.
- 12. a half of a circle or of its circumference.
- 14. the sixteenth letter of the Greek alphabet ( Π, π ), transliterated as ‘p.’.
Down
- 1. a part of the circumference of a circle or other curve.
- 2. concentric circles are circles with a common center.
- 3. In geometry, the tangent line to a plane curve at a given point is the straight line that "just touches" the curve at that point
- 8. the middle point of a circle or sphere, equidistant from every point on the circumference or surface
- 13. a straight line from the center to the circumference of a circle or sphere