# How To Calculate Tangent Of An Angle

**How To Calculate Tangent Of An Angle** – Any high school student who has encountered trigonometry in their math curriculum has likely encountered the laws of sine, cosine, and area, which are commonly used to solve triangles, where some information is given and the rest must be calculated. Somewhat surprisingly (since it’s relatively simple to obtain), the “tan rule” is usually not included in this particular trigonometric toolkit. However, as we hope to show in this article, this principle can be very useful under certain circumstances. Especially when two sides and an angle included in a triangle are given. In this situation, it is not possible to immediately apply the law of sines to determine the other angles, since none of the given sides is opposite to the given angle. To determine the third side, first apply the law of cosines, then apply the law of sines to one (or both) of the remaining angles. However, the tan rule allows us to determine one of the two missing angles without reference to the law of sines or cosines.

This derivation follows in the footsteps of Appendix A. The latter is a translation (from Stephen Hawking’s book: On the Shoulders of Giants) of an extract from “Liber Primus” from “De Revolutionibus Orbium Coelestium” written by a certain Nicolaus Copernicus and published after his death in 1543. It should be noted that the “theorem” is older because Copernicus derived his geometry from Greek sources, especially Euclid and Ptolemy. He (Copernicus), however, notes the later introduction of Arabic numerals:

## How To Calculate Tangent Of An Angle

“This notation surpasses any other – Greek or Latin – in its exceptional ease of use, and is easily adapted to any computing class.”

#### Secants, Chords, And Tangents (video)

The diagram of triangle ABC below shows the sides AB (i.e. c) and BC (i.e. a) and the included angle ABC ##(hat)##. From point A drop a perpendicular to point D to the side BC, extended if necessary according to whether D is inside the triangle ##;(hat## acute) or outside the triangle ##;( hat## open). The triangle is now divided into two right triangles ABD and ADC. Since the angle at D is a right angle and given ##hat##, we can calculate AD as ##csinhat## and BD as ##ccoshat##. CD can then be defined as the difference between BC and BD: ##a-ccoshat##.

(Note that this difference will be negative if ##hat## is blunt, in which case ##tanhat## will be negative as expected.)

Therefore, in the right-angled triangle ADC, given the sides AD and CD, we can find AC and the angle ACD.

### Solved Show Your Matlab Commands, M Files, And Results. 1.

And it will not be different if the angle B is obtuse as shown in the diagram above. The perpendicular from point A to line BC is extended to form a right-angled triangle ABD, where AD=c sin(180-##hat##)=c sin##hat## and BD=c cos(180-## hat##)=-c cos##hat##.

Since BA and BC are in a certain ratio (BA:BC = c:a = k:1), AB is given by (c=ka) in the same parts as BD (##=-kacoshat ##) and all CBD (##=a-kacoshat##) are given.

Accordingly, in the right-angled triangle ADC, since two sides AD and CD are given, then AC (i.e. b) is also given the side and angle ##hat##.

### Question Video: Finding The Measure Of An Angle Given The Measure Of An Arc By Using The Properties Of Tangents To The Circle

An important point to note in the second half of the above derivation (##hat##) is that Copernicus moves from reference to specific parties to a relationship of specific parties. When solving for angle C using the “tan law”, the absolute values of a given pair of sides are unnecessary as long as the ratio between them is known. This reflects the last formula ##tanhat## and is illustrated in Practical Examples 1 and 4.

PF user kuruman notes that given the formula (say) ##tanhat=frac}}}##, the other two tan coefficients can be found using cyclic permutation, ##Arightarrow B rightarrow C rightarrow A## lowercase and uppercase. Or if we start with ##tanhat=frac}}}}## with a similar circular permutation in the opposite direction ##Arightarrow C rightarrow B rightarrow A##.

We will explore three physical applications where the “Tan Law” can be usefully applied. The first is Compton scattering, in which a photon strikes a stationary electron and a momentum transfer occurs, resulting in the photon being “scattered” at an angle that depends on the change in frequency (energy) of the incident and scattered photon. Generally, two angles need to be specified, namely the angle of the scattered photon and the angle of the electron. Both are measured from the original direction of motion of the incident photon.

## Solved] Figure With Each Point Is Must.. Question # 1: Two Tangents…

The second objective is to determine the projectile’s launch angle(s) if it hits a target that has known horizontal and vertical coordinates (measured from the point of launch). In this application we will use the ##vectimesvec=vectimesvec## vector equation described in the previous article titled “Quarter Projectile in Motion”.

The third is two-dimensional elastic collisions between two masses – one moving and the other stationary. As with Compton scattering, we find that the angles of the post-collision trajectory of the two masses (relative to the direction of the moving mass before the collision) depend on the energy transferred from one to the other, as well as (depending on the case). ) mass ratio. And after determining one angle based on the energy relationship, we can determine the other using the arson rule.

You can see that there are some interesting similarities between these seemingly different physical applications. Impulse and/or momentum are physical vector quantities in any situation, and the angle of deflection is related to the change in energy. In each case, the 3 vector quantities involved form a triangle in which 2 sides and the included angle are known or can be calculated. The second angle can then be determined using the “tan law”.

#### What Is The Inverse Of Cosine?

Although we focus on momentum and energy applications in this article, the “tan law” is obviously as versatile in use as its “siblings”, the law of sine and cosine. In the first of the “worked examples” provided, the “tanning rule” is illustrated in a problem involving 3 forces in equilibrium. Of course, the vector sum of such forces will be zero, and the vector associated with them is a closed triangle in which the ratio of the two sides is given along with the included angle, and we need to find a pair of unknowns. angle. The other 3 practical examples refer to the above physical applications.

Below is a vector diagram representing Compton scattering. The momentum of the incident photon is equal to the sum of the momentum of the scattered photon and the incident electron. The electron is assumed to be initially at rest.

In order to use the tan law to determine the trajectory angle ##phi## of the electron, we first need the deflection angle ##theta_d## between the incident and scattered photons. We could just use the known result, but for completeness we will include a short derivation of it.

#### Law Of Tangents

As mentioned above, we will use the vector equation ##vectimesvec=vectimesvec## to determine the two possible projectile projectile angles aimed at a target with known coordinates (measured from the starting point). ##vec a## is the acceleration, ##vec## is the displacement from the launch point, and ##vec u## and ##vec v## are the initial and final velocities of the projectile, respectively. For projectile motion ###vec a=0;hat} -g;hat}## and ###vec s=R;hat} + h;hat}##, where R is the target horizontal range and h is its vertical height above the starting point. Hence ##vectimesvec=gR ;hat}##. We can write ##vectimesvec## as ##|v| |u| sintheta_d; hat}## where ##theta_d## is the angle between the initial and final velocity vectors. From this we get the equation: $$sintheta_d=frac.$$ Here we follow the method described by J. Gibson Winans in an article titled “Convenient Equations for Shotile Motion” from the American Journal of Physics. This paper uses a structural technique to determine the elevation angles, while here we have used an analytical approach using the “tan law” described above. Also in this paper, the above vector equation was derived from the mathematics of quaternion products, while here we present a derivation based on Newton’s second law applied to angular momentum.

We start by “transforming” the vector equations into an angular momentum equation by simply multiplying both sides by the ball’s mass m: $$mvectimesvec=mvectimesvec.$$ Then, in terms of the ball’s motion # #m vectimesvec## represents the gravitational moment of the projectile relative to its launch point. Taking an example from PF user @TSny (who originally identified the physical meaning of the vector equation as described here), we can show that the right-hand side of the equation ##(mvec v times vec u)## represents the rate of change of angular momentum according to with Newton’s second law applied to angular motion: $$L=mvectimesvec=mvectimesfrac+vec)t}=fractimesvec) t }$$

$$implies dot L=mleft(fractimesvec}+fractimesvec)t}right).$$ Write ##vec a## as ##frac##, the above will simplify to $$dot L =mleft(fractimesvec}+fractimesvec}right)=mvec v times vec u$$

### If The Angle Between Two Tangents Drawn From An External Point ‘p’ To

Using the “tan law” we can now “solve” the following velocity vector plot to obtain an expression for the launch angle(s) versus the initial horizontal velocity of the projectile.

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