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 Spherical TrigonometryW.E. Dean, 1837 - 318 σελίδες |
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Αποτελέσματα 1 - 5 από τα 26.
Σελίδα 219
... sine of a quadrant , or of a right angle , is equal to the radius . COR . 2. The sine of an arc is half the chord of twice that arc : this is evi- dent by producing the sine of any arc till it cut the circumference . K L CE F A BD I ...
... sine of a quadrant , or of a right angle , is equal to the radius . COR . 2. The sine of an arc is half the chord of twice that arc : this is evi- dent by producing the sine of any arc till it cut the circumference . K L CE F A BD I ...
Σελίδα 220
... sine , tangent , or secant of the complement of any angle is called the Cosine , Cotangent , or Cosecant of that angle . Thus , let CL or DB , which is equal to CL , be the sine of the angle CBH ; HK the tangent , and BK the secant of ...
... sine , tangent , or secant of the complement of any angle is called the Cosine , Cotangent , or Cosecant of that angle . Thus , let CL or DB , which is equal to CL , be the sine of the angle CBH ; HK the tangent , and BK the secant of ...
Σελίδα 221
... sine of the angle C , ( Def . 4. ) ; therefore CB : BA :: R : sin . C. G D B Also , because EG touches the cir- cle in E , CEG is a right angle , and therefore equal to the angle BAC ; and since the angle at C is common FE A to the ...
... sine of the angle C , ( Def . 4. ) ; therefore CB : BA :: R : sin . C. G D B Also , because EG touches the cir- cle in E , CEG is a right angle , and therefore equal to the angle BAC ; and since the angle at C is common FE A to the ...
Σελίδα 222
... sine of the arc AC ; and BH or LK being the sine of AB , DK is the sum of the sines of the arcs AC and AB , and CK is the difference of their sines ; DAB also is the sum of the arcs AC G F C B E A and AB , because AD is equal to AC ...
... sine of the arc AC ; and BH or LK being the sine of AB , DK is the sum of the sines of the arcs AC and AB , and CK is the difference of their sines ; DAB also is the sum of the arcs AC G F C B E A and AB , because AD is equal to AC ...
Σελίδα 226
... sine of half the angle included between the two sides of the triangle . Let ABC be a triangle of which BC is the base , and AB the greater of the two sides ; 4AB.AC : ( BC + ( AB - AC ) ) × ( BC- ( AB - AC ) ) : : R2 : ( sin . BAC ) 2 ...
... sine of half the angle included between the two sides of the triangle . Let ABC be a triangle of which BC is the base , and AB the greater of the two sides ; 4AB.AC : ( BC + ( AB - AC ) ) × ( BC- ( AB - AC ) ) : : R2 : ( sin . BAC ) 2 ...
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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 Let the straight 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 spherical angle spherical triangle square straight line BC THEOR touches the circle triangle ABC triangle DEF wherefore
Δημοφιλή αποσπάσματα
Σελίδα 51 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.
Σελίδα 12 - AB; but things which are equal to the same are equal to one another...
Σελίδα 80 - 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.
Σελίδα 288 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 35 - Parallelograms upon the same base and between the same parallels, are equal to one another.
Σελίδα 81 - If a straight line touch a circle, and from the point of contact a straight line be drawn cutting the circle, the angles made by this line with the line which touches the circle, shall be equal to the angles in the alternate segments of the circle.
Σελίδα 52 - If a straight line be divided into any two parts, the squares of the whole line, and of one of the parts, are equal to twice the rectangle contained by the whole and that part, together with the square of the other part. Let the straight line AB be divided into any two parts in the point C ; the squares of AB, BC are equal to twice the rectangle AB, BC, together with the square of AC.
Σελίδα 127 - 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.
Σελίδα 23 - If, from the ends of the side of a triangle, there be drawn two straight lines to a point within the triangle, these shall be less than, the other two sides of the triangle, but shall contain a greater angle.
Σελίδα 19 - The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles. Let the straight line AB make with CD, upon one side of it the angles CBA, ABD ; these are either two right angles, or are together equal to two right angles. For, if the angle CBA be equal to ABD, each of them is a right angle (Def.