Books Books
D ; wherefore the remaining angle at C is equal to the remaining angle at F ; Therefore the triangle ABC is equiangular to the triangle DEF.
The Elements of Euclid, Viz: The Errors, by which Theon, Or Others, Have ... - Page 165
by Robert Simson - 1775 - 520 pages

## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Euclid's Elements - 1847 - 317 pages
...than a right angle ; which is absurd. Therefore the angles ABC, DEF are not unequal, that is, they are equal : And the angle at A is equal to the angle at...triangle DEF. Next, let each of the angles at C, F bo not less than a right angle ; the triangle ABC is also, in this case, equiangular to the triangle...

## The first three books of Euclid's Elements of geometry, with theorems and ...

Euclides, Thomas Tate - 1849 - 108 pages
...it: And the angle at A is half of the angle BGC, and the angle at D half of the angle EHF : Therefore the angle at A is equal to the angle at D. Wherefore in equal circles, &c. QED PROP. XXVIII. THEOR. In equal circles, equal straight lines cut off" equal...

## The geometry, by T. S. Davies. Conic sections, by Stephen Fenwick

...: And the angle at A is half of the angle BGC, and the angle at D half of the angle EHF ; therefore the angle at A is equal to the angle at D. Wherefore, in equal circles, etc. QED PROPOSITION XXVIII. THEOR. In equal circles, equal straight lines cut off"...

## The synoptical Euclid; being the first four books of Euclid's Elements of ...

Euclides - 1853
...angle at A is half of the angle BGC, and the angle at D half of the angle EHF; therefore (Ax. 7.) 4. The angle at A is equal to the angle at D. Wherefore, in equal circles, &c. QED PROP. XXVIII. THEOREM. In equal circles, equal straight lines cut off equal...

## The first six books of the Elements of Euclid, with numerous exercises

Euclides - Geometry - 1853 - 147 pages
...it. And the angle at a is half of the angle bgС, and the angle at d half of the angle ehf: therefore the angle at a is equal to the angle at d. Wherefore, in equal circles, &c. QED PROPOSITION XXVIII. — THEOREM., In equal circles, equal straight lines...

## The Elements of Euclid, with many additional propositions, and explanatory ...

Euclides - 1855
...same manner it may be shown that the angle at E is not greater than the angle ABC; therefore they are equal, and the angle at A is equal to the angle at...remaining angle at C is equal to the remaining angle at F ; and the triangles ABC and DEF are equiangular, and therefore have the sides about the equal angles...

## Elements of Geometry: Containing the First Six Books of Euclid with a ...

John Playfair - Geometry - 1855 - 318 pages
...than a right angle; which is absurd. Therefore the angles ABC, DEF are not unequal, that is, they are equal: And the angle at A is equal to the angle at...remaining angle at C is equal to the remaining angle atF; Therefore the triangle ABC is equiangular to the triangle DEF. wherefore (4. 6.), AB : BG :: DE...

## The Elements of geometry; or, The first six books, with the eleventh and ...

Euclides - 1855
...equal to the angle D EF (I. Ax. 1). For the same reason, the angle A С B is equal to the angle D FE, and the angle at A is equal to the angle at D. Therefore the triangle AB С is equiangular to the triangle DE F. Wherefore, if the sides, &e. QED...