## Elements of Plane and Spherical Trigonometry: With Practical Applications |

### From inside the book

Results 1-5 of 28

Page 14

... angle , or arc , is greater than 90 ° , its complement is negative . Thus the complement of 127 ° is 37 ° . ― - Since the

... angle , or arc , is greater than 90 ° , its complement is negative . Thus the complement of 127 ° is 37 ° . ― - Since the

**two**acute angles of a**right**-**angled triangle**are together**equal**to a**right angle**, they are complements one of ... Page 18

...

...

**THE SAME**ANGLE . 57. To find the COSINE of an angle by means of its sine . From the**right**-**angled triangle**ABC ( Geom . , Prop . XI . Bk . IV . ) we have p2 + b2 = h2 . Dividing both sides of the equation by h2 A B h b Q gives h2 p3 b2 ... Page 26

...

...

**equilateral triangle**, then each of its angles**equals**one third of**two right angles**, or 60 ° . Draw BD perpendicular to AC , then the angle ABD is**equal**to ABC , A D is**equal**to DC , and AD BC = AB . B Therefore , A D C AD sin ABD AB ... Page 41

...

...

**triangle**are the three sides and the three angles . Three of ...**triangle**. The solution of plane**triangles**depends upon the following FUNDAMENTAL PROPOSITIONS . 109. In a**right**-**angled triangle**, the side opposite to an acute angle is**equal**... Page 43

...

...

**triangle**, the square of any side is**equal**to the sum of the squares of the**two**other sides , diminished by twice the rectangle of these sides multiplied by the cosine of the included angle . Let ABC be any plane**triangle**...**right**-**angled**...### Other editions - View all

### Common terms and phrases

A B C A+ log acute angle adjacent sides Algebra angle equal angle of elevation angle opposite angle or arc ar.co.log Arithme column headed cos² cosec Cotang decimal denoted divided Elementary Algebra equation Equations Art EXAMPLES feet find the SINE formulæ Geom Geometry given number Given the hypothenuse Greenleaf's New Series half the sum Hence included angle log cos log cot log sin logarithmic cosine logarithmic sine logarithmic tangent M.
M. Sine minus the logarithmic Napier's rules negative oblique oblique-angled spherical triangle Parker's Exercises perpendicular plane triangle Prop right-angled spherical triangle right-angled triangle equal rods School secant side b equal side opposite sin A cos sin A sin sin a+b sin² sine and cosine Solution solve the triangle spherical triangle ABC SPHERICAL TRIGONOMETRY subtract sun's declination suvers suversed sine Tang tangent of half trigonometric functions values whence yards

### Popular passages

Page 4 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.

Page 7 - This process, like its converse (Art. 23), is based upon the supposition that the differences of logarithms are proportional to the differences of their corresponding numbers.

Page 4 - The logarithm of any POWER of a number is equal to the product of the logarithm of the number by the exponent of the power. For let m be any number, and take the equation (Art. 9) M=a*, then, raising both sides to the wth power, we have Mm = (a")m = a"" . Therefore, log (M m) = xm = (log M) X »»12.

Page 74 - Spherical Triangle the cosine of any side is equal to the product of the cosines of the other two sides, plus the product of the sines of those sides into the cosine of their included angle ; that is, (1) cos a = cos b...

Page 43 - In every plane triangle, the sum of two sides is to their difference as the tangent of half the sum of the angles opposite those sides is to the tangent of half their difference.

Page 39 - ... be at the head of the column, take the degrees at the top of the table, and the minutes on the left ; but if the name be at the foot of the column, take the degrees at the bottom, and the minutes on the right.

Page 46 - The cosine of half of any angle of a plane triangle is equal to the square root of half the sum of the three sides, into half the sum less the side opposite the angle, divided by the rectangle of the two adjacent sides.