Trigonometry

Wikipedia has no reference of Democritus' contribution to Trig. He contributed to Atomic theory, and to Geometry. Some Geometry and Trig. topics overlap, so maybe that is what you are referring to.

equilateral traingle

Many ways in designing the project, such as solving the structure's force-polygons and calculating component dimensions. Surveying for design, site setting-out and quality-control.

For a function of only one variable it mean the derivative with respect to that variable.

Thus, f'(x) = df(x)/dx.

Occasionally, it can also refer to a variation of a function. For example, a family of functions, f(x), f'(x), f''(x) and so on.

2pi/60 or pi/30 radians per second

Using Pythagoras' theorem the third side works out as 4 units in length.

depends on the branch of math, and the math function/relation you are talking about

Video comes from the Latin word videre, meaning To see.

copy this and paste in your browsers address window

http://www.wolframalpha.com/input/?i=tan+theta+%2B+sec+theta+%3D1

Use tangent to find the other leg, and the sine or cosine to find the hypotenuse.

The Pythagorean Theorem was not made, it was discovered by an ancient Greek philosipher named Pythagoras.

"A greek phylosopher proposed a theory that when two squares are drawn with a common corner and their sides are perpendicular to each other then a third square whose side connects to the corners of the adjacent sides of the first two squares will have an area that is equal to the sum of areas of the first two squares.

let

square1 be Area1 = X x X = X^2

square2 be Area2 = Y x Y = Y^2

Square3 be Area3 = H x H = H^2

the sides are X, Y, H form the triangle whose 90 deg angle is between X and Y.

He states that the sum of the squares of these sides = the square of the thid side.

He is actually reffering to the areas of the three squares. "From...(ENAC)

Colleges offer multiple semester-long classes in trigonometry; it's not something we can teach you in a few paragraphs on a website. If you're really interested, I recommend you take a class at a community college.

Neither, it is a mathematical discipline.

A three sided polygon in which two sides are equal in length and two angles are equal in size.

The answer depends on what other information is available to you.

This site is not suitable for graphs.

It is the reciprocal of the sine ratio.

Many decades ago, children's roller skates were made of metal, and clamped on to children's shoes. They were tightened with a small metal "key" which would pull brackets in between the soles of the shoes and the upper leather bodies of the shoes.

Then there was a leather strap that was affixed to the back of the skate near the heel of the shoe, and it went over the top of the skater's ankle, to help hold the skate on the foot.

Metal shoe skates were used almost exclusively in streets to avoid cracks in the sidewalk that might make you take a nasty fall. Even so, these skates were so cheap and shoddy they often fell off, leaving the skater with one skate on and one dangling by the leather strap as the skater went skate, clomp, skate, clomp to a sudden stop.

They were truly... cheap skates.

as I understand it back in the early 1900's there there was a woman named Kate Robinson, she was a panhandler and inherited a fortune but continued to beg. So people would tell thrifty people you are as cheap as Kate and it got shortened to cheapskate

Tan x is negative or zero for all x between (pi/2, pi] and all odd multiples of that interval, i.e. (3pi/2, 2pi], etc.

sda

Thales

A tangent is a line that just touches a curve at a single point and its gradient equals the rate of change of the curve at that point.

I would guess it is a pyramid that has a seven-sided polygon as its base.

Usually a straight line that touches a curve at one point. At the point of contact, the tangent is perpendicular to the radius of curvature.

""Inasmuch as many have taken in hand to set in order a narrative of those things which have been fulfilled among us, just as those who from the beginning were eyewitnesses and ministers of the word delivered them to us, it seemed good to me also, having had perfect understanding of all things from the very first, to write to you an orderly account, most excellent Theophilus, that you may know the certainty of those things in which you were instructed.""