Trigonometry

30*30

The volume increases faster. (proportional to the cube of the radius)

The surface area increases slower. (proportional to the square of the radius)

The domain can be anything you like as long as it excludes the point x = -40.The range is the set of all values that y can take for the values of x in the domain of your choice.

you can use it to find heights of trees or buildings and stuff. It is good for distances too.

They are I II III and IV

abaaka

For finding the angles in a right angled triangle the ratios are:

sine = opposite divided by the hypotenuse

cosine = adjacent divided by the hypotenuse

tangent = opposite divided by the adjacent

First write everything in terms of sines and cosines.

2 sin x / cos x - (1 / cos x)2 = 0

Multiply by the common denominator, cos2x:

2 sin x cos x - 1 = 0

Solve:

2 sin x cos x = 1

sin 2x = 1

2x = pi/2, or 2x = 5pi/2, or 2x = 9pi/2...

For the first one, 2x = pi/2 --> x = pi/4.

Trigonometry is the branch of mathematics that deals with right triangles, and given TWO pieces of information (a side and an angle or two sides), you can calculate everything else about that triangle. (Note that having only two ANGLES does NOT provide enough information to calculate the length of the sides though...)

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_5227490_pass-mind-part-unknown-sides.html

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

NON right angles can be calculated using the Law of Sines and the Law of Cosines.

0. sin 2x = cos 3x

1. sin 2x = sin (pi/2 - 3x) [because cos u = sin (pi/2 - u)]

2. [...]

89.52 degrees.

A pentagon.

There are several different ways and the answers depend on what is known about the triangles.

right angle=90 degrees and a right triangle has one side of it that forms a 90 degree angle...as for the naming "right" don't know but it refers to 90 degree angle

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

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

Tetrahedron

they use it by using the right calculations

Could it be a protractor?

The volume increase - ib proportion to the cube of the linear increase.

7.15 minus 6.25 = 0.9

3045.5 mm3 = 3.0455 cm3 or 3.0455 cc

solomon's metalen

Rheticus had facilitated the publication of Copernicus' work, and had clearly understood the basic principles of the new planetary theory.

In 1551, with the help of six assistants, Rheticus recalculated and produced the Opus Palatinum de Triangulis (Canon of the Science of Triangles) which became the first publication of tables of all six trigonometric functions. This was intended to be an introduction to his greatest work, The Science of Triangles.

When he died his work was still unfinished, but like Copernicus, Rheticus acquired a student, Valentinus Otho who supervised the calculation (by hand) of some one hundred thousand ratios to at least ten decimal places filling some 1,500 pages. This was finally completed in 1596. These tables were accurate enough to be used as the basis for astronomical calculations up to the early 20th century.

An inscribed circle, possibly.