 | Humanities - 1885 - 480 pages
...isosceles, and lastly in the scalene; those that came after them proved the general theorem as follows: — "The three angles of every triangle are equal to two right angles." So also in the sections of a cone ; for they viewed the so-called " section of the rightangled cone... | |
 | George William Usill - Surveying - 1889 - 306 pages
...the two interior angles H i A and HA i ; and because the angles A v H and iv E are equal, and that the three angles of every triangle are equal to two right angles, therefore the two angles VIE and s EH are together equal to the two angles AH v and HA i, and therefore... | |
 | George Johnston Allman - Geometry - 1889 - 266 pages
...and lastly in the scalene ; those that came after them proved the general theorem as follows : — " The three angles of every triangle are equal to two right angles." So also in the sections of a cone ; for they viewed the so called " section of the rightangled cone... | |
 | Edward Albert Bowser - Geometry - 1890 - 420 pages
...a quadrilateral have two of its opposite sides parallel, and the other two equal but not parallel, any two of its opposite angles are together equal to two right angles. 24. On the sides AB, BC, and CD of a parallelogram. ABCD three equilateral triangles are described,... | |
 | Rupert Deakin - Euclid's Elements - 1891 - 102 pages
...quadrilateral figure has two of its opposite sides parallel, and the other two sides equal but not parallel, any two of its opposite angles are together equal to two right angles. 6. The parts of all perpendiculars to two parallel lines intercepted between them are equal. PART V.... | |
 | Henry Martyn Taylor - 1893 - 486 pages
...a quadrilateral have two of its opposite sides parallel, and the two others equal but not parallel, any two of its opposite angles are together equal to two right angles. 3. If a straight line which joins the extremities of two equal straight lines, not parallel, make the... | |
 | Henry Martyn Taylor - Euclid's Elements - 1895 - 708 pages
...a quadrilateral have two of its opposite sides parallel, and the two others equal but not parallel, any two of its opposite angles are together equal to two right angles. 3. If a straight line which joins the extremities of two equal straight lines, not parallel, make the... | |
 | Bernard Bosanquet - Logic - 1895 - 188 pages
...Predicate. " William Pitt was a great statesman "=" There ' was a great statesman named William Pitt " ; " The three angles of every triangle are equal to two right angles " = " There are figures known as triangles with their three angles equal to two right angles " ; "... | |
 | Bernard Bosanquet - Logic - 1897 - 188 pages
...Predicate. " William Pitt was a great statesman " = " There was a great statesman named William Pitt" ; " The three angles of every triangle are equal to two right angles " = " There are figures known as triangles with their three angles equal to two right angles"; "All... | |
 | Education - 1895 - 696 pages
...Birmingham can't understand! Get to the heart of it. Don't grant him anything. Don't be quite sure that the three angles of every triangle are equal to two right angles; and don't at all allow, until you are yourself fairly convinced, that parallel straight lines produced... | |
| |
The opposite angles of any quadrilateral figure described in a circle, are toe/ether equal to two right angles. Let ABCD be a quadrilateral figure in the circle ABCD : any two of its opposite angles are together equal to two right angles. 
