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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.
Euclid in Paragraphs: The Elements of Euclid: Containing the First Six Books ... - Page 71
by Euclid - 1845 - 199 pages

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

Robert Simson - Trigonometry - 1827 - 513 pages
...of any quadrilateral .figure inscribed in a circle, are together equal to two right angles. 1 20. 3. Let ABCD be a quadrilateral figure in the circle ABCD; any two of its opposite angles shall together be equal to two right angles. Join AC, BD : and because the three angles of every •32.1....

## History of the Transmission of Ancient Books to Modern Times: Or, A Concise ...

Isaac Taylor - Bible - 1827 - 322 pages
...more readily and by a simpler and more compact process than that of the other. If it were denied that the three angles of every triangle are equal to two right angles, an actual measurement of lines, or the placing of two pieces of card one over the other, would end...

## History of the Transmission of Ancient Books to Modern Times: Or, A Concise ...

Isaac Taylor - Bible - 1827 - 256 pages
...more readily and by a simpler and more compact process than that of the other. If it were denied that the three angles of every triangle are equal to two right angles, an actual measurement of lines, or the placing of two pieces of card one over the other, would end...

## A popular and practical treatise on masonry and stone-cutting

Peter Nicholson - Masonry - 1828 - 272 pages
...straight lines AF and BD, and consequently making the angle at G equal to the A angle FAC ; and since the three angles of every triangle are equal to two right angles, and since the angles FAC, CAB, BAE, are also equal to two right angles, and since FAC is equal to the...

## The Evidences of Christianity in Their External Or Historical Division ...

Charles Pettit McIlvaine - Apologetics - 1832 - 534 pages
...certainty. In mathematical reasoning, our knowledge is greater than our ignorance. When you have proved that the three angles of every triangle are equal to two right angles, there is an end of doubt, because there are no materials for ignorance to work up into phantasms ;...

## The Evidences of Christianity in Their External Or Historical Division ...

Charles Pettit McIlvaine - Apologetics - 1832 - 534 pages
...certainty. In mathematical reasoning, our knowledge is greater than our ignorance. When you have proved that the three angles of every triangle are equal to two right angles, there is an end of doubt, because there are no materials for ignorance to work up into phantasms; but...

## Operative Masonry: Or, A Theoretical and Practical Treatise of Building ...

Edward Shaw - Architecture - 1832 - 244 pages
...straight lines AF and BD, and consequently making the angle at G equal to the angle FAC ; and since the three angles of every triangle are equal to two right angles, and since the angles FAC, CAB, BAE, are also equal to two right angles, and since FAC is equal to the...

## Methodist Magazine and Quarterly Review, Volume 3; Volume 14

Methodist Church - 1832 - 510 pages
...There are some, of which we can say that we know them ; others, that we believe them. We know that the three angles of every triangle are equal to two right angles. We do not doubt that there is such a country as England, and that such a king as Henry VIII. formerly...