Euclid's Elements
Book VI
DEFINITIONS
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| 1. |
Similar rectilineal figures are such as have their angles severally equal and the sides about the equal angles proportional. |
| [2. |
Reciprocally related figures. This definition is neither used by Euclid nor translated by Heath.] |
| 3. |
A straight line is said to have been cut in extreme and mean ratio when, as the whole line is to the greater segment, so is the greater to the less. |
| 4. |
The height of any figure is the perpendicular drawn from the vertex to the base. |
Book VI Propositions
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