Elementary Text-book of TrigonometryBlackie & Son, 1884 - 176 páginas |
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... Euclid I. 32 , Cor . 1 , the five angles of a regular pentagon are together equal to ( 5 × 2−4 ) or 6 right angles . Hence each 6 6 × = angle = right angle = 90 ° 108 ° . 5 5 Ex . 2. The angles of a triangle are as 1 : 2 : 3 ; find the ...
... Euclid I. 32 , Cor . 1 , the five angles of a regular pentagon are together equal to ( 5 × 2−4 ) or 6 right angles . Hence each 6 6 × = angle = right angle = 90 ° 108 ° . 5 5 Ex . 2. The angles of a triangle are as 1 : 2 : 3 ; find the ...
Página 6
... Euclid I. 32 , Cor . 1 , the five angles of a regular pentagon are together equal to ( 5 × 2−4 ) or 6 right angles . Hence each 6 angle - right angle = × 90 ° = 108 ° . 6 5 5 Ex . 2. The angles of a triangle are as 1 : 2 : 3 ; find the ...
... Euclid I. 32 , Cor . 1 , the five angles of a regular pentagon are together equal to ( 5 × 2−4 ) or 6 right angles . Hence each 6 angle - right angle = × 90 ° = 108 ° . 6 5 5 Ex . 2. The angles of a triangle are as 1 : 2 : 3 ; find the ...
Página 9
... Euclid VI . 33 , angle AOB : angle AOC :: arc AB : arc AC ; therefore radian right angle :: r : 2πr 4 π :: 1 : therefore radians = right angle , 2 or radian 2 right angles = π Since represents a definite number , the radian is a ...
... Euclid VI . 33 , angle AOB : angle AOC :: arc AB : arc AC ; therefore radian right angle :: r : 2πr 4 π :: 1 : therefore radians = right angle , 2 or radian 2 right angles = π Since represents a definite number , the radian is a ...
Página 21
... . Now the length of AC can be found by Euclid I. 47. For by that proposition , since the angle ACB is a right angle , sq . on AB = sq . on AC + sq . on BC ; hence if x denote the length of AC in feet TRIGONOMETRICAL RATIOS . 21.
... . Now the length of AC can be found by Euclid I. 47. For by that proposition , since the angle ACB is a right angle , sq . on AB = sq . on AC + sq . on BC ; hence if x denote the length of AC in feet TRIGONOMETRICAL RATIOS . 21.
Página 24
... Euclid I. 47. For by that proposi- u tion , AB2 AC2 + BC2 = a2 + a2 = 202 ; therefore , taking the square root , AB = a √√2 . We now know the lengths of all the sides of this right- angled triangle ABC and we can write down the values ...
... Euclid I. 47. For by that proposi- u tion , AB2 AC2 + BC2 = a2 + a2 = 202 ; therefore , taking the square root , AB = a √√2 . We now know the lengths of all the sides of this right- angled triangle ABC and we can write down the values ...
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Términos y frases comunes
angle AOB angle BAC angle increases angle less Article base centre circumference cloth boards common logarithm complement cos(A+B cos2A cos4A cosB cosC cose cosecA cosine cotA cotangent decimal places degree measure diameter distance equal equation Euclid EXAMPLES feet Find the angle Find the height find the number find the values flagstaff following angles formula given Hence hypotenuse inches log2 loga logarithms of numbers magnitude mantissa miles negative numbers number expressing number of degrees numerical value perpendicular positive Prove quadrant radian measure radii ratios of angles regular polygon respectively right angle right-angled triangle sec²A secA secant side BC Similarly sin(A sin(A+B sin2A sin2B sin3A sinB sine sine and cosine square root table of logarithms tan(A+B tan²A tanA tanB tangent tanß tower triangle ABC trigono trigonometrical ratios unit of angle yards
Pasajes populares
Página 90 - The logarithm of the product of two or more numbers is equal to the sum of the logarithms of the numbers. For, let m and n be two numbers, and x and y their logarithms. Then, by the definition of a logarithm, m — ax, and n = a".
Página 90 - ... the logarithm of a fraction is equal to the logarithm of the numerator minus the logarithm of the denominator.
Página 118 - In any triangle, the sides are proportional to the sines of the opposite angles. That is, sin A = sin B...
Página 149 - Find the length of the side of a square whose area is equal to that of a rectangle the sides of which are 94 '28 and 6720 yards.
Página 89 - The logarithm of a number is the index of the power to which the base of the system must be raised to equal a given number.
Página 158 - The sides of a triangle are in arithmetical progression, and its area is to that of an equilateral triangle of the same perimeter as 3 : 5.