Plane and Spherical TrigonometryGinn, 1915 - 230 páginas |
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Página 18
... observed to be 20 ° . How high is the tree ? We have or a = b tan A , @ = : 150 tan 20 ° = 150 x 0.3640 = 54.6 . Hence the height of the tree is 54.6 ft . + 5 ft . , or 59.6 ft . 2. From a point A on a cliff 60 ft . high , including the ...
... observed to be 20 ° . How high is the tree ? We have or a = b tan A , @ = : 150 tan 20 ° = 150 x 0.3640 = 54.6 . Hence the height of the tree is 54.6 ft . + 5 ft . , or 59.6 ft . 2. From a point A on a cliff 60 ft . high , including the ...
Página 19
... observed at the same instant from two lighthouses , L and L ' , 3 mi . apart . L'LS is found to be 40 ° and ZLL'S is found to be 90 ° . What is the distance of the ship from L ' ? What is its distance from L ? 140 ° L ' 3 20. From the ...
... observed at the same instant from two lighthouses , L and L ' , 3 mi . apart . L'LS is found to be 40 ° and ZLL'S is found to be 90 ° . What is the distance of the ship from L ' ? What is its distance from L ? 140 ° L ' 3 20. From the ...
Página 20
... observed to have an angle of depression of 35 ° . How far is the point from the tower ? M 35 ° 300 13. From the extremity of the shadow cast by a church spire 150 ft . high the angle of elevation of the top is 53 ° . What is the length ...
... observed to have an angle of depression of 35 ° . How far is the point from the tower ? M 35 ° 300 13. From the extremity of the shadow cast by a church spire 150 ft . high the angle of elevation of the top is 53 ° . What is the length ...
Página 22
... observed under an angle of depres- sion of 22 ° . How far is the boat from the point of observation ? 15. Seen from a point on the ground the angle of elevation of the top of a telegraph pole 27 ft . high is 28 ° . How far is it from ...
... observed under an angle of depres- sion of 22 ° . How far is the boat from the point of observation ? 15. Seen from a point on the ground the angle of elevation of the top of a telegraph pole 27 ft . high is 28 ° . How far is it from ...
Página 29
... observed , by aid of an instrument 5 ft . above the ground , to be 42 ° 4 ' . What is the height of the building ? 34. From the top of a building 62 ft . 6 in . high , including the instrument , the angle of depression of the foot of an ...
... observed , by aid of an instrument 5 ft . above the ground , to be 42 ° 4 ' . What is the height of the building ? 34. From the top of a building 62 ft . 6 in . high , including the instrument , the angle of depression of the foot of an ...
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Plane and Spherical Trigonometry, and Surveying G. A. (George Albert) 1835-1 Wentworth Sin vista previa disponible - 2015 |
Términos y frases comunes
9 log acute angle angle of depression angle of elevation characteristic circle colog cologarithm computation cos(x cos² cos²x cosecant cot log cotangent cotx decimal places degrees Dividing equal equation example Exercise Find log Find the area Find the distance Find the height Find the length Find the value given the following graph Hence horizontal hypotenuse included angle interpolation latitude Law of Cosines Law of Sines Law of Tangents log cos log log cot 9 log sin log logarithm longitude mantissa negative perpendicular polygon positive quadrant radians radius right angle right spherical triangle right triangle roots secant secx sexagesimal ship sails sides sin B sin sin log cos sin(x sin² solution solve the triangle spherical triangle subtends subtract tabular difference tangent triangle ABC whence
Pasajes populares
Página 109 - Sines that the bisector of an angle of a triangle divides the opposite side into parts proportional to the adjacent sides.
Página 98 - I sin y \2 / \2 / = sin x cos y + cos x sin y, sin (a; — y) = sin (x + (— y)) = sin a; cos (— y) + cos a; sin (— y) = sin x cos y — cos x sin y, tan (x + y) = sin (x + y) sin x cos y + cos x...
Página 52 - The logarithm of a quotient is equal to the logarithm of the dividend minus the logarithm of the divisor.
Página 44 - If the number is less than 1, make the characteristic of the logarithm negative, and one unit more than the number of zeros between the decimal point and the first significant figure of the given number.
Página 50 - The logarithm of a product is equal to the sum of the logarithms of its factors.
Página 57 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Página 116 - In any obtuse triangle, the square of the side opposite the obtuse angle is equal to the sum of the squares of the other...
Página 112 - Two sides of a triangle, and the angle opposite one of them, being given, to describe the triangle. Let A and B be the given sides, and C the given angle.
Página 128 - Prove that the area of a parallelogram is equal to the product of the base, the diagonal, and the sine of the angle included by them.
Página 151 - Equation 3, we see that an angle of 1 rad is the angle subtended at the center of a circle by an arc equal in length to the radius of the circle (see Figure 2).