**High School Trigonometry/Radian Measure Wikibooks open**

The law of cosines generalizes the Pythagorean theorem, which holds only for right triangles: if the angle Î³ is a right angle (of measure 90 degrees, or Ï€ / 2 radians), then cos Î³ = 0, and thus the law of cosines reduces to the Pythagorean theorem:... In degree-mode the answer you got from your law of cosines --is the cosine of your angle. . . So to find the angle, simply take the arccosine of your initial answer 0.949283806 to get angle A; see here:

**How do you evaluate sin ((7pi)/8) using the half angle**

In physics, sometimes you have to find the angle and magnitude of a vector rather than the components. To find the magnitude, you use the Pythagorean theorem. And to find you use the inverse tangent function (or inverse sine or cosine). For example, assume youâ€™re looking for a hotel thatâ€™s 20...This section looks at Sin, Cos and Tan within the field of trigonometry. A right-angled triangle is a triangle in which one of the angles is a right-angle. The hypotenuse of a right angled triangle is the longest side, which is the one opposite the right angle.

**Section 4 Sine And Cosine Rule CIMT**

Find the distance of a boat from a lighthouse if the lighthouse is 100 meters tall, and the angle of depression is 6Â°. Solution . The angle of depression is the angle below straight ahead -- horizontal -- that an oberver must look in order to see something below the observer. how to cancel td debit card online A simple derivation is: An equilateral triangle has all sides equal and all angles equal to $60^{\circ}$. Therefore a triangle with angle $30^{\circ}$ (which is a bisected equilateral) has a hypotenuse of 1 and a short side of $\frac12$, so $\sin(30^{\circ})=\frac12$.. How to clean leather jacket inside

## How To Find An Angle From The Answer Of Cos

### How to Find the Sin Cos and Tan of an Angle Sciencing

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## How To Find An Angle From The Answer Of Cos

### 4/06/2008Â Â· If you know the sine of an angle and are looking to find the size of the angle that has that sine, you use the sin^-1 key on your calculator.

- In physics, sometimes you have to find the angle and magnitude of a vector rather than the components. To find the magnitude, you use the Pythagorean theorem. And to find you use the inverse tangent function (or inverse sine or cosine). For example, assume youâ€™re looking for a hotel thatâ€™s 20
- 17/05/2010Â Â· Another way to go about it, is to draw a unit circle, mark out the angle from the center and find the coordinates of the intersection with the unit circle. The X coordinate would be the cosine of the angle, and the Y coordinate would be the sine.
- The trigonometric function sine, like the cosine and the tangent, is based on a right-angled triangle. In math class, the sine of an angle is found by dividing the length of the side opposite the angle by the length of the hypotenuse.
- If you wanted to get a value for tan x, follow the steps above to find sin x and cos x for the for the equivalent angle and divide one by the other. Of course this doesnâ€™t help if youâ€™re working in radians!

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