Definitions
- Definition 1.
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Similar rectilinear figures are such as have their angles severally equal and the sides about the equal angles proportional.
- Definition 2.
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Two figures are reciprocally related when the sides about corresponding angles are reciprocally proportional.
- Definition 3.
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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.
- Definition 4.
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The height of any figure is the perpendicular drawn from the vertex to the base.
