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Proposition: 1.36: Parallelograms on Equal Bases and on the Same Parallels

Euclid's Formulation

Parallelograms which are on equal bases and between the same parallels are equal to one another.

• Let $ABCD$ and $EFGH$ be parallelograms which are on the equal bases $BC$ and $FG$, and (are) between the same parallels $AH$ and $BG$.
• I say that the parallelogram $ABCD$ is equal to $EFGH$.

Modern Formulation

Parallelograms (\(\boxdot{ADCB}\) , \(\boxdot{EHGF}\)) on equal bases (\(\overline{BC}\), \(\overline{FG}\)) and standing between the same parallels (\(\overline{AH}\), \(\overline{BG}\)) are equal in area.

Table of Contents

Proofs: 1

Mentioned in:

Proofs: 1 2 3 4 5

Thank you to the contributors under CC BY-SA 4.0!

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@Calahan

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@Fitzpatrick

References

Adapted from CC BY-SA 3.0 Sources:

1. Callahan, Daniel: "Euclid’s 'Elements' Redux" 2014

Adapted from (Public Domain)

1. Casey, John: "The First Six Books of the Elements of Euclid"

Adapted from (subject to copyright, with kind permission)

1. Fitzpatrick, Richard: Euclid's "Elements of Geometry"