Volume 2

The elements of Euclid explain'd. In a new, but most easie method, together with the use of every proposition through all parts of the mathematicks / Written in French, by that exccellent [sic] mathematician F. Claud. Francis Milliet de Chales ... And now carefully done into English. And purg'd from a multitude of errors, which had escap'd in the original.

Euclid

Date:: 1685

Credit: The elements of Euclid explain'd. In a new, but most easie method, together with the use of every proposition through all parts of the mathematicks / Written in French, by that exccellent [sic] mathematician F. Claud. Francis Milliet de Chales ... And now carefully done into English. And purg'd from a multitude of errors, which had escap'd in the original. Source: Wellcome Collection.

76/392 page 66

$PROPOSITION XXXH. Tallel to che line AB. à Demonstration. . The lines AB and CE are parallels, cherefore {by the 19.] the alternate angles ECA and CAB are equal ; and [47 the fame| che external angle ECD is equal co che internal, B. And by con- fequence the whole angle ACD, being equal to both che angles ACE, and ECD, of which it 18 and Brakentogether. . . | In the fecond place. _ The angles ACD and AGB are equal to two right angles (äy the 13°) and I have demonftrated che angle. ACD. tobe equal το both che angles A and. B taken tose-$

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