The Elements of Plane and Solid Geometry: With Chapters on Mensuration and Modern GeometryPorter & Coates, 1879 - 266 páginas |
Dentro del libro
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Página 18
... sides respect- ively equal to A , B , C. Scholium . - In practice we need not describe the whole circle . Two small arcs intersecting at G will be sufficient . Corollary . - If the triangle is to be equilateral 18 GEOMETRY . — BOOK I.
... sides respect- ively equal to A , B , C. Scholium . - In practice we need not describe the whole circle . Two small arcs intersecting at G will be sufficient . Corollary . - If the triangle is to be equilateral 18 GEOMETRY . — BOOK I.
Página 19
... equilateral ( Def . 15 ) , it is only necessary to know one side , AB . From A and B , with radii equal to AB , describe ( Post . 3 ) arcs of circles cutting in C. ABC is an equilateral triangle . Proposition 4 . A B Theorem . — If two ...
... equilateral ( Def . 15 ) , it is only necessary to know one side , AB . From A and B , with radii equal to AB , describe ( Post . 3 ) arcs of circles cutting in C. ABC is an equilateral triangle . Proposition 4 . A B Theorem . — If two ...
Página 21
... equilateral triangles are mutu- ally equiangular , it must not be supposed that the converse is true- viz . , that mutually equiangular triangles are mutually equilateral . Two triangles may have their angles equal , each to each , and ...
... equilateral triangles are mutu- ally equiangular , it must not be supposed that the converse is true- viz . , that mutually equiangular triangles are mutually equilateral . Two triangles may have their angles equal , each to each , and ...
Página 24
... equilateral triangle DFE ; join AF . AF will bisect BAC . Because in the two triangles DAF , EAF , AD is equal to AE , DF to EF , and AF common , therefore ( I. 4 ) , the angle DAF is equal to the angle EAF . Therefore BAC is bisected ...
... equilateral triangle DFE ; join AF . AF will bisect BAC . Because in the two triangles DAF , EAF , AD is equal to AE , DF to EF , and AF common , therefore ( I. 4 ) , the angle DAF is equal to the angle EAF . Therefore BAC is bisected ...
Página 26
... equilateral triangle DFE ; join CF. CF is at right angles to AB . F Because in the triangles DCF , ECF , DC is equal to EC , DF to EF , and CF common , therefore ( I. 4 ) the angles DCF , ECF , opposite the equal sides , are equal . But ...
... equilateral triangle DFE ; join CF. CF is at right angles to AB . F Because in the triangles DCF , ECF , DC is equal to EC , DF to EF , and CF common , therefore ( I. 4 ) the angles DCF , ECF , opposite the equal sides , are equal . But ...
Otras ediciones - Ver todas
The Elements of Plane and Solid Geometry: With Chapters on Mensuration and ... Isaac Sharpless Sin vista previa disponible - 2016 |
The Elements of Plane and Solid Geometry: With Chapters on Mensuration and ... Isaac Sharpless Sin vista previa disponible - 2017 |
Términos y frases comunes
A-BCD AB² ABCD altitude angle ABC angle ACB angle BAC apothem bisect centre of similitude chord circle ABC circumference cone Corollary cylinder decagon describe diagonals diameter divided draw equal angles equiangular feet figure four right angles frustum given circle given straight line greater Hence inscribed interior angles intersect isosceles Let ABC line joining lune meet middle point multiplied number of sides opposite angles parallelogram parallelopiped pass perimeter perpendicular plane pole polyedron prism produced Prop proportional Proposition 12 Proposition 13 pyramid quadrilateral radical axis radii radius rectangle contained regular polygon right angles Scholium segment semicircle similar similar triangles slant height solid solid angle sphere spherical triangle square surface symmetrical tangent Theorem Theorem.-If three sides triangle ABC vertex
Pasajes populares
Página 53 - If a straight line be divided into any two parts, the rectangle contained by the whole and one of the parts, is equal to the rectangle contained by the two parts, together with the square of the aforesaid part.
Página 81 - On a given straight line to describe a segment of a circle, containing an angle equal to a given rectilineal angle. Let AB be the given straight line, and...
Página 31 - Any two angles of a triangle are together less than two right angles.
Página 128 - Wherefore, in equal circles &c. QED PROPOSITION B. THEOREM If the vertical angle of a triangle be bisected by a straight line which likewise cuts the base, the rectangle contained by the sides of the triangle is equal to the rectangle contained by the segments of the base, together with the square on the straight line which bisects the angle.
Página 15 - AXIOMS. 1. 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.
Página 82 - To cut off a segment from a given circle which shall contain an angle equal to a given rectilineal angle. Let ABC be the given circle, and D the given rectilineal angle ; it is required to cut off a segment from the circle ABC that shall contain an angle equal to the given angle D.
Página 62 - If a straight line be divided into two equal, and also into two unequal parts ; the squares on the two unequal parts are together double of the square on half the line, and of the square on the line between the points of section.
Página 166 - A be a solid angle contained by any number of plane angles BAC, CAD, DAE, EAF, FAB: these together are less than four right angles. Let the planes...
Página 15 - LET it be granted that a straight line may be drawn from any one point to any other point. 2. That a terminated straight line may be produced to any length in a straight line.
Página 120 - Similar polygons may be divided into the same number of similar triangles, having the same ratio to one another that the polygons have ; and the polygons have to one another the duplicate ratio of that which their homologous sides have.