## Elements of Geometry: Containing the First Six Books of Euclid, with a Supplement on the Quadrature of the Circle, and the Geometry of Solids. To which are Added, Elements of Plane and Sperical TrigonometryW.E. Dean, 1844 - 317 páginas |

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Página 44

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**radius**equal to AB , the other given side , would cut BC on opposite sides of C ' ; so that only one obtuse angled triangle could be B A formed ; that is , the triangle BC'A will be the triangle required . And , if the given angle were ... Página 45

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**radius**equal to the other given side , describe an arc , cutting CB in B ; draw AB , and CAB will be the triangle requi- red . But if the given angle is acute , and the side opposite to it less than the other given side ; make the angle ... Página 46

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**radius**equal to the side of the other square , describe an arc cutting AD in D : the square described upon AD will be equivalent to the difference of the squares constructed upon AC and CD . For the triangle DAC is right angled ... Página 61

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**radius**of a circle is the straight line drawn from the centre to the circumference . 1. A straight line is said to touch a circle , when it meets the cir- cle , and being produced does not cut it . And that line which has but one point ... Página 85

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**radius**drawn to the point of contact is perpendicular to the tangent , it follows that the angle included by two tangents , drawn from the same point , is bisected by a line drawn from the centre of the circle to that point ; for this ...### Otras ediciones - Ver todas

### Términos y frases comunes

ABC is equal ABCD adjacent angles altitude angle ABC angle ACB angle BAC base BC bisected centre chord circle ABC circumference cosine cylinder demonstrated described diameter divided draw equal and similar equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle fore four right angles given rectilineal given straight line greater Hence hypotenuse inscribed join less Let ABC magnitudes meet multiple opposite angle parallel parallelogram parallelopiped perpendicular polygon prism PROB PROP proportional proposition quadrilateral radius ratio rectangle contained rectilineal figure remaining angle right angled triangle SCHOLIUM segment semicircle shewn side BC sine solid angle solid parallelopiped spherical angle spherical triangle square straight line BC THEOR touches the circle triangle ABC triangle DEF wherefore

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Página 95 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...

Página 68 - THE angles in the same segment of a circle are equal to one another...

Página 23 - Straight lines which are parallel to the same straight line are parallel to one another. Triangles and Rectilinear Figures. The sum of the angles of a triangle is equal to two right angles.

Página 74 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.

Página 78 - IF from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, shall be equal to the square of the line which touches it.

Página 9 - 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.

Página 75 - If a straight line touch a circle, and from the point of contact a...

Página 18 - AT a given point in a given straight line, to make a rectilineal angle equal to a given rectilineal angle. Let AB be the given straight line, and A...

Página 134 - EQUIANGULAR parallelograms have to one another the ratio which is compounded of the ratios of their sides.

Página 136 - AB is (7. 5.) to AD, as AE to AG ; and DC to CB, as GF to FE; and also CD to DA, as FG to GA ; therefore the sides of the parallelograms ABCD, AEFG about the equal angles are proportionals; and they are therefore similar to one another (1.