ECF; and they are adjacent angles. But, when the adjacent angles which one straight line makes with another straight line are equal to one another, each of them is called a right IT angle ; therefore each of the angles DCF, ECF, is a right angle. Stories about Mathematics-land - Page 69by D. Ponton - 1927Full view - About this book
| Robert Simson - Trigonometry - 1806 - 546 pages
...; therefore the angle DCF e&1. is equal c to the angle ECF; and they are adjacent angles. But, when **the adjacent angles which one straight line makes with another straight line** are equal to one another, each of them •110. Def. is called a right d angle ; therefore each of the... | |
| Euclides - 1816 - 588 pages
...• 3. 1. -fore the angle DCF is%eequal0 to the angle ECF ; and they ,are adjacent angles. But, when **the adjacent angles which one straight line makes with another straight line** are 10 Def. equal to one anotlfci, ra1 h of them is called a right d angle; therefore each of the angles... | |
| John Playfair - 1819 - 354 pages
...therefore the angle DCF is equal (8. 1.) to the angle ECF ; and they are adjacent angles. But, when **the adjacent angles which one straight line makes with another straight line** are equal to one another, each of them is called a right (7. def.) angle ; therefore each of the angles... | |
| Rev. John Allen - Astronomy - 1822 - 508 pages
...(Def. 20). PROP. XIII. THEOR. The angles (ABC, ABD), which me right line (AB), makes with another (CD), **on one side of it, are together equal to two right angles.** FyA. Cor.—If more right lines stand on the same right line (CD), on the same side of it, and at the... | |
| Robert Simson - Trigonometry - 1827 - 546 pages
...base EF ; therefore the angle DCF is equal* to the angle ECF; and they are adjacent angles. But when **the adjacent angles which one straight line makes with another straight line,** are equal to one another, each of them is called a right* angle; therefore each of the angles DCF,... | |
| John Playfair - Geometry - 1829 - 210 pages
...straight line AB. ; PROPOSITION XIII. THEOREM. The two angles which one straight line makes with another, **on one side of it, are together equal to two right angles*** Let the straight line AB make with CD, on one side of CD, the angles ABC, ABD; these are together equal... | |
| Thomas Perronet Thompson - Euclid's Elements - 1833 - 168 pages
...the third side EF ; therefore the angle DCF is* equal to ECF ; and they are adjacent angles. But when **the adjacent angles which one straight line makes with another straight line** are fI.Nom.37. equal to one another, each of them ist a right angle ; therefore each of the angles... | |
| Euclid - 1835 - 540 pages
...therefore the angle DCF is equal c to the c g. j angle ECF; and they are adjacent angles. But when **the adjacent angles which one straight line makes with another straight line** are equal to one another, each of them is called a right d angle ; therefore each of the angles DCF,... | |
| Euclid, James Thomson - Geometry - 1837 - 410 pages
...therefore, the angle DCF is equal ( I. 8.) to the angle ECF ; and they are adjacent angles. But, when **the adjacent angles which one straight line makes with another straight line,** are equal to one another, each of them is called (I. def. 8.) a right angle; therefore each of the... | |
| John Playfair - Euclid's Elements - 1837 - 332 pages
...therefore the angle DCF is equal (8. 1.) to the angle EOF ; and they are adjacent angles. But, when **the adjacent angles which one straight line makes with another straight line** are equal to one another, each of them is called a right (7. def.) angle ; therefore each jf the angles... | |
| |