Across
- 4. an angle of 90°
- 5. two angles that have the same vertex and a side in common.
- 8. d=√((x2 – x1)² + (y2 – y1)²).
- 10. less than 90 degrees.
- 11. Angles either of two angles whose sum is 180°.
- 12. an angle of 180°.
Down
- 1. a point at or near the center or middle.
- 2. each of the pairs of opposite angles made by two intersecting lines.
- 3. Angles either of two angles whose sum is 90°.
- 5. the space between two intersecting lines or surfaces at or close to the point where they meet.
- 6. more than 90° and less than 180°.
- 7. they are formed when two lines intersect each other at a single point.
- 9. at an angle of 90° to a given line, plane, or surface.