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 Βιβλία Βιβλία
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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## The Mathematical Monthly, Τόμος 2

1860 - 462 σελίδες
...figure must be aliquot parts of the circle or of four right angles. All the angles of any such figure are equal to twice as many right angles as the figure has sides minus four right angles, or if « be the number of sides, the sum of all the angles is (2n —...

## A course of geometrical drawing

William Schofield Binns - 1861 - 206 σελίδες
...let the required polygon be a pentagon. From Euc. I., 32, Cor. 1, "All the angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides." From this corollary, we can deduce a formula for finding the angle of any polygon. Let x equal...

## Elements of Geometry and Conic Sections

Elias Loomis - 1861 - 244 σελίδες
...there are sides of the polygon BCDEF. Also, the anGEOMETRY. gles of the polygon, together with lour right angles, are equal to twice as many right angles as the figure has sides (Prop. XXVIII., BI) ; hence all the angles of the triangles are equal to all the angles of the...

## Euclid's Elements of geometry, books i. ii. iii. iv

Euclides - 1862 - 140 σελίδες
...the common vertex of all the triangles, are equal to four right angles. (I. 15, cor. 2.) 6. Therefore all the angles of the figure, together with four right...equal to twice as many right angles as the figure has sides. Corollary. — 2. All the exterior angles of any rectilineal figure are together equal to four...

## The school Euclid: comprising the first four books, by A.K. Isbister

Euclides - 1862 - 172 σελίδες
...are equal to twice as many right angles as there are angles or sides. but all the interior angles, together with four right angles, are equal to twice as many right angles as the figure has sides ; (cor. 1) therefore all the interior angles, together with all the exterior angles, are equal...

## Responsions

University of Oxford - 1863 - 328 σελίδες
...fall on it from the opposite angle, and the acute angle. 4. All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides. 5. Describe a parallelogram equal to a given rectilineal figure, and having an angle equal to...

## The elements of plane geometry; or, The first six books of Euclid, ed. by W ...

Euclides - 1863 - 122 σελίδες
...point F within the Cor. 1.—All the interior angles (ABC, BCD, &c.) of any rectilineal figure (ABCDE) together with four right angles are equal to twice as many right angles as the figure has sides. ., figure to each of its angles. \ Because the three interior angles of a triangle are equal...

## A Practical Treatise on the Science of Land and Engineering Surveying ...

Henry S. Merrett - 1863 - 428 σελίδες
...sides. It has been proved by the foregoing corollary that all the interior angles, together with the four right angles, are equal to twice as many right angles as the figure has sides. Therefore all the interior angles, together with all the exterior angles, are equal to all the...

## A practical treatise on ... land and engineering surveying, Τόμος 34

Henry S. Merrett - 1863 - 476 σελίδες
...sides. It has been proved by the foregoing corollary that all the interior angles, together with the four right angles, are equal to twice as many right angles as the figure has sides. Therefore all the interior angles, together with all the exterior angles, are equal to all the...

## The school edition. Euclid's Elements of geometry, the first six books, by R ...

Euclides - 1864 - 448 σελίδες
...angles of the triangles are equal to twice as many right angles as the figure has sides ; therefore all the angles of the figure together with four right...equal to twice as many right angles as the figure has sides. COR. 2. All the exterior angles of any rectilineal figure, made by producing the sides successively...