Trigonometry

I am not exactly sure how well these will work for you, but here are two great videos from Khan Academy and PatrickJMT that show two different ways to solve your problem. Stick with them, I know that they can be confusing.

Please see related links for helpful videos

An equilateral triangle has three sides which are all of exactly the same length, and three internal angles which are all 60o.

A complex number, equations and graphs can show electromagnetic forces-for instance two wires carrying current. A formula like (z-1)/(z+1) can show the fields around two parallel wires.

You would need to use de Moivre's theorem.

8

bottom left.

It is 0.28

For this, you need the Pythagorean theorem.

Let A equal x + 9

Let C equal 26

A^2 + B^2 = C^2

(x + 9)^2 + B^2 = 26^2

x^2 + 18x + 81 + B^2 = 676

x^2 + 18x + B^2 = 595

This doesn't help you find x, but I hope this did something!

It is an ordered pair (or triplet), which defines the distances of any point in 2 (or 3) dimensional space from a fixed point, called the origin, and along an orthogonal set of axes which cross at the origin.

A bathtub. It will hold at least 1 litre of water.

A tetrahedron.

There are two types of functions in trigonometry: there are functions that are mappings from angles to real numbers, and there are functions that are mappings from real numbers to angles. In some cases, the domains or ranges of the functions need to be restricted.

You cannot.

1/sqrt(4 - x^2) = 1/[sqrt(4 - 4*sin^2(u)]

= 1/2 * 1/[sqrt(1 - *sin^2(u)]

= 1/2 * 1/[sqrt(cos^2(u)]

= 1/2 * 1/cos(u)

= 1/[2*cos(u)]

Whatever that is, it is not = 1.

I suspect that the question concerns integration but in for that the limits of integration are required. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.

No. An equilateral triangle must also be equi-angular, meaning that the angles can only ever have 60 degrees.

The easiest way to do this is to use a calculator or a cosine table. If you do not have a calculator, you must try one of several other options. If you know the sine or other trigonometric value of the angle, you can use trig identities. Some angles have good cosines, like 0, 30, 45, 60, 90, and so on. These values are known, and should be memorized. Cos(0) = 1, cos(30) = SQRT(3)/2, cos(45) = SQRT(2)/2, cos(60) = 1/2, and cos(90) = 0. The list continues, but I won't go on here. You may be able to use the angle addition formulas or half or double angle formulas to find the value of your angle. If this still doesn't work, you could approximate qualitatively by looking at a cosine curve, or you could use calculus methods, like Euler's method or a Taylor or Maclauren series to approximate the value. I won't go into detail here, but you can look up any of these topics on Google or Wikipedia.

how to figure things out using known rules

Check out these articles for a simple free tool and tutorials 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

180-71.57=108.43

You use the Pythagorean theorem, which can only be applied to right triangles:

a2+b2=c2, where a and b are the triangle's legs and c is the triangle's hypotenuse.

Plug the two sides you know into the equation, then solve for the unknown side.

The sides are equal and the internal angles are equal each being 60 degrees hi im STEVE(not really)

The tangent ratio.

The ancient Babylonians thought it a good idea. 360 is approximately equal to the number of days in a year - the time it takes the earth to go around the sun. Also, 360 is divisible by lots of numbers.

For advanced mathematics, you do not use 360 degrees but pi radians, anyway.

No, there isn't.

We need the name of the person in order to answer the question.

Acute, right, obtuse, straight, reflex.