Euclid's plane geometry, practically applied; book i, with explanatory notes, by H. Green |
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Side 13
In surveying , for the measurement of angles from any point to distant objects ,
several instruments have been ... SCF , with fine cross wires on the object glass F
. There are also spirit levels attached , for ascertaining the true horizontal line .
In surveying , for the measurement of angles from any point to distant objects ,
several instruments have been ... SCF , with fine cross wires on the object glass F
. There are also spirit levels attached , for ascertaining the true horizontal line .
Side 23
The height of an object , AB , and the length of its shadow BC are the same ,
when the light , which the object , AB , intercepts , is at an elevation of 45° : for the
angles BCA , BAC , being each half a rt . angle , the sides which subtend them
are ...
The height of an object , AB , and the length of its shadow BC are the same ,
when the light , which the object , AB , intercepts , is at an elevation of 45° : for the
angles BCA , BAC , being each half a rt . angle , the sides which subtend them
are ...
Side 33
... by the lines which cause the angle of reflection to equal the angle of incidence
. Hence , by means of a mirror placed horizontally , we may construct a triangle
the perpendicular of which shall be representative of the height of any object .
... by the lines which cause the angle of reflection to equal the angle of incidence
. Hence , by means of a mirror placed horizontally , we may construct a triangle
the perpendicular of which shall be representative of the height of any object .
Side 44
The use of parallel lines enables the Surveyor to ascertain the distance of an
inaccessible object , by the method of Representative Values or of Construction :
thus , there are three objects , A , B , C , distant from each other AC 6 miles , AB 8
...
The use of parallel lines enables the Surveyor to ascertain the distance of an
inaccessible object , by the method of Representative Values or of Construction :
thus , there are three objects , A , B , C , distant from each other AC 6 miles , AB 8
...
Side 58
... triangles that the sides about the equal angles are proportional , the height of
an inaccessible object can be ascertained , provided a measurement to the
perpendicular from the object can be made . - See Euclid Practically Applied ,
Prop .
... triangles that the sides about the equal angles are proportional , the height of
an inaccessible object can be ascertained , provided a measurement to the
perpendicular from the object can be made . - See Euclid Practically Applied ,
Prop .
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Vanlige uttrykk og setninger
ABCD added angle equal apply ascertain assumed Axioms base base BC bisected centre circle circumference coincide common Conc construct contained definition demonstration describe diagonal diameter distance divided draw drawn earth's equal Euclid extremity fall feet figure four Geometry given given point greater half height impossible inches inference intersect join length less line BC measure meet miles named object opposite parallel parallelogram perpendicular plane practical principle produced Prop proposition proved reason rectangle rectil rectilineal representative right angles scale sides square straight line suppose surface thing third triangle true truth units Wherefore whole
Populære avsnitt
Side 36 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.
Side 17 - If a straight line meets two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Side 17 - Things which are equal to the same thing are equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be taken from equals, the remainders are equal. 4. If equals be added to unequals, the wholes are unequal. 5. If equals be taken from unequals, the remainders are unequal. 6. Things which are double of the same are equal to one another.
Side 41 - We assume that but one straight line can be drawn through a given point parallel to a given straight line.
Side 13 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Side 16 - LET it be granted that a straight line may be drawn from any one point to any other point.
Side 54 - 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.
Side 21 - If two angles of a triangle be equal to one another, the sides also which subtend, or are opposite to, the equal angles, shall be equal to one another.
Side 22 - Upon the same base, and on the same side of it, there cannot be two triangles that have their sides which are terminated in one extremity of the base, equal to one another, and likewise those which are terminated in the other extremity.
Side 12 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Bibliografisk informasjon
| Tittel | Euclid's plane geometry, practically applied; book i, with explanatory notes, by H. Green |
| Forfatter | Euclides |
| Redaktør | Henry Green |
| distribuert | 1863 |
| Original fra | Oxford University |
| Digitalisert | 14. nov 2006 |
| Eksporter sitat | BiBTeX EndNote RefMan |