Easy Introduction to Mathematics, Volume 2Barlett & Newman, 1814 |
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Page 268
... rectangle is a parallelogram which has all , its angles right angles ( or which has one of its angles a right angle ; see the foregoing note . ) 36. A square is a rectangle which has all its sides equal . 37. All other four - sided ...
... rectangle is a parallelogram which has all , its angles right angles ( or which has one of its angles a right angle ; see the foregoing note . ) 36. A square is a rectangle which has all its sides equal . 37. All other four - sided ...
Page 286
... rectangle is found by multiplying the two sides about one of its angles into each other , and the area of a square by multiplying the side into itself . 147. Prop . 35. From this proposition , and the preceding article , we derive a ...
... rectangle is found by multiplying the two sides about one of its angles into each other , and the area of a square by multiplying the side into itself . 147. Prop . 35. From this proposition , and the preceding article , we derive a ...
Page 288
... rectangle con- tained by any two given straight lines may be described . 154. The squares of equal straight lines are equal to one another . Let the straight lines AB and CD be equal , then will the squares ABEF , CDGH F E H G described ...
... rectangle con- tained by any two given straight lines may be described . 154. The squares of equal straight lines are equal to one another . Let the straight lines AB and CD be equal , then will the squares ABEF , CDGH F E H G described ...
Page 291
... rectangles and squares , shewing that the squares or rectangles of the parts of a line , divided in a specified manner , are equal to other rectan- gles or squares of the parts of the same line , differently divided : by what rectangle ...
... rectangles and squares , shewing that the squares or rectangles of the parts of a line , divided in a specified manner , are equal to other rectan- gles or squares of the parts of the same line , differently divided : by what rectangle ...
Page 292
... rectangle , although this seems to be the sole object of the definition ; instead then of Euclid's definition , let the following be substituted . " Every right angled parallelogram is called a rectangle ; and this rectangle is said to ...
... rectangle , although this seems to be the sole object of the definition ; instead then of Euclid's definition , let the following be substituted . " Every right angled parallelogram is called a rectangle ; and this rectangle is said to ...
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Common terms and phrases
Algebra arithmetical progression axis base bisected called centre chord circle circumference CN² co-sec co-sine co-tan completing the square Conic Sections cube curve diameter distance divided draw EC² equal Euclid Euclid's Elements EXAMPLES.-1 find the numbers former fourth fraction geometrical geometrical progression given equation given ratio greater harmonical mean Hence infinite series inversely last term latter latus rectum less likewise logarithms magnitude method multiplied number of terms odd number parallel parallelogram perpendicular PN² polygon problem Prop proposition Q. E. D. Cor quadrant quotient radius rectangle remainder right angles rule secant shew shewn sides sine solidity straight line substituted subtract tangent theor theorems third triangle unknown quantity VC² versed sine whence wherefore whole numbers x=the
Popular passages
Page 280 - If a straight line touch a circle, and from the point of contact a chord be drawn, the angles which this chord makes with the tangent are equal to the angles in the alternate segments.
Page 235 - If two triangles have two sides of the one equal to two sides of the...
Page 247 - TO a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Page 62 - If four magnitudes are proportional, the sum of the first and second is to their difference as the sum of the third and fourth is to their difference.
Page 353 - In the same way it may be proved that a : b : : sin. A : sin. B, and these two proportions may be written a : 6 : c : : sin. A : sin. B : sin. C. THEOREM III. t8. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference. By Theorem II. we have a : b : : sin. A : sin. B.
Page 232 - But things which are equal to the same are equal to one another...
Page 256 - If a straight line be bisected, and produced to any point ; the rectangle contained by the whole line thus produced, and the part of it produced, together with the square of half the line bisected, is equal to the square of the straight line which is made up of the half and the part produced.
Page 160 - Take the first term from the second, the second from the third, the third from the fourth, &c. and the remainders will form a new series, called the first order of
Page 269 - II. Two magnitudes are said to be reciprocally proportional to two others, when one of the first is to one of the other magnitudes as the remaining one of the last two is to the remaining one of the first.
Page 272 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.