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F, which is the common vertex of the triangles ; that is, together with four right angles. Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
The First Six Books: Together with the Eleventh and Twelfth - Σελίδα 38
των Euclid - 1781 - 520 σελίδες
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...external < a, is equal to t wo right Angles (by tbe^tb /)confequently all the internal and external Angles are equal to twice as many right Angles as the Figure has fides. But all its internal Angles are equal to twiee as many right Angles eicept 4 as it has fides (by the...

## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

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...is the common Vertex of the triangles ; that is ", toM. i. gether with four right angles. Therefore all the angles of the figure^ together with four right...twice as many right angles as the figure has fides. C o R. 2 . All the exterior angles of any rectilineal figure are together equal to four right angles....

## Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books

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...fpoken of, is equal to two right angles, all the angles of tiie figure, together with thefe outward angles, are equal to twice as many right angles as the figure has angles, that is, has fides. But fince all the inward angles together, with four right angles, has been...

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...angles of any regular polygon* 3By cor. i ft, I. 32. Euclid. All the anterior angles of any reoilineal figure, together with four right angles, are equal...twice as many right angles as the figure has fides. Hence the following rule. RULÉ. From double thé number of fides f übt vail: 4, and the remainder...

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...angles. Wherefore, if a fide of a triangle, &c. Q^ED CoR. i. All the interior angles of any rectilineal figure, together with four right angles, are equal...twice as many right angles as the figure has fides. For For any reftilineal figure ABCDE can be divided into as many triangles as the figure has fides,...

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...which is the common Vertex of the triangles; that is », 1' together with four right angles. Therefore all the angles of the figure, together with four right angles, are equal to twice as manyright angles as the figure has fides. CoR. 2. All the exterior angles of any rectilineal figure...