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Trigonometry

Trigonometry is a field of mathematics. It is the study of triangles. Trigonometry includes planar trigonometry, spherical trigonometry, finding unknown values in triangles, trigonometric functions, and trigonometric function graphs.

3,810 Questions

How many rpm does a 18 inch dia wheel turn at 80 mph?

The circumference of an 18 inch diameter wheel is 3.14159 times 18 inches, or about 4.712 feet. 80 miles per hour is 80 times 5280 divided by 60, or about 7040 feet per minute. Divide 7040 by 4.712 and you get about 1494 revolutions per minute.

What angle is a cube?

The measure of the angle of a cube is pi/2 steradians.

What is the difference between a tacheometer and a theodolite?

A tacheometer is a type of theodolite used for rapid measurements. It determines the distance to the target electronically or electro-optically. Tacheometry is a system of rapid surveying that does not use chain or tape. There are times when measuring with a theodolite and measuring tape can be dangerous or impossible.

A theodolite is an older surveying tool. Those were just precision optical devices used to compute angles between known fixed points, and they required using trigonometry to get the final values. However, there are modern versions of theodolites called Total Stations that are more convenient to use than even a tacheometer. These will cost you about $50,000 a piece or so.

Please note that the question asks about a tacheometer (or tachymeter) which is a surveying tool, not a tachometer which measures engine speed.

How do you express Cosecant in terms of Cosine?

cosec (x) = 1/(sqrt(1-cos^2 (x))) x is real. Take the functions with proper signs. sqrt(c) denotes the square root of real c.

Difference of plane and spherical triangles?

A plane triangle looks like a common triangle. A plane triangle is solved with linear units. A spherical triangle is found inside of a sphere. This type of triangle is solved with angular units.

What are the kinds of trigonometry?

The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.

The radius of a car wheel is 15 inches How many revolutions per minute is the wheel making when the car is traveling at 60 mph?

60 mph = 88 feet/sec = (88 x 12) inches per sec = (88 x 12 x 60) in/min = 63,360 inches per minute

Circumference of the wheel = 2 pi R = 30 pi inches.

RPM = (63,360) / (30 pi) = 672.27 rev per min (rounded)

What is the sin function?

It is a trigonometric function. It is also continuous.

What is the Conclusion of spherical Trigonometry?

The subject has not concluded: there are still aspects of it that can be developed so it is premature to talk about the conclusion of the subject.

What is complete number system?

One of them is the Hindu-Arabic numeral system which we use today and another is the Roman numeral system which was used by the ancient Romans

What is the period of a 2 MHz sine wave?

2 x 10 to power 6 cycles in 1 sec. Period is (1) / (2 x 10 to power 6)

= (0.5) x (10 to the power -6)

= 0.5 microseconds

What is the perimeter of a triangle with no stated angles and only 2 stated sides and its not a right-angled triangle?

The perimeter of a triangle, given only two sides and no information about angles, cannot be determined. However, it can be said (if the two given sides were A and B) that the perimeter cannot be less than 2A or 2B, whichever is more, nor more than 2(A+B).

These are limiting cases. In the first case, A or B approaches zero, which makes C approach B or A. In the second case, A and B have an angle approaching 180 degrees, making C approach A+B.

How do you understand trigonometry?

It is simple the study of triangles: the properties of their sides and angles. This is then extended to other, more complicated polygons and polyhedra, but the basis is still the triangle.

How do you do the circumferences and the diameters?

The answers depend on what you want to "do" and what information you have.

How do you work out the angle of a triangle using tan trigonometry?

Check out these articles for a simple free tool and tutorial that will make trig simple enough for ANYBODY to do!

http://www.ehow.com/how_5520340_memorize-trig-functions-losing-mind.html

http://www.ehow.com/how_5227490_pass-mind-part-unknown-sides.html

http://www.ehow.com/how_5428511_pass-part-ii-unknown-angles.html