Across
- 3. At an angle of 90° to a given line, plane, or surface or to the ground
- 8. A stable subatomic particle with a charge of negative electricity, found in all atoms
- 9. An essential or characteristic part of something abstract
Down
- 1. Having two sides of equal leperpenngth (of a triangle)
- 2. A plane figure with three straight sides and three angles
- 3. Side by side and having the same distance continuously between them (of lines, planes, or surfaces)
- 4. Having sides unequal in length (of a triangle)
- 5. The central and most important part of an object
- 6. A subatomic particle of about the same mass as a proton but without an electric charge
- 7. A positive electric charge equal in magnitude to that of an electron