You have always used this table

##

Another method

###

**We can Calculate the angle by the left and right method**.

As you know these are some basic angle

**0 ° 30 ° 45 ° 60 ° 90°**

These are five angles that we get out of

**Eg sin30 °, sin45 ° etc**

**Tan45 °, tan 90 °, tan30 ° etc.**

**Cos0 ° cos30 ° etc**

You just have to remember three formulas (L = left)

(R = right)

**1. SinΦ = √L / 4 **

**2.cosΦ = √R / 4 **

**3. TanΦ= √L / R **

With example

Suppose we have to find the value of sin30 °

Formula is** sin = √L / 4**

Left of 30 ° is an angle 0 ° so L = 1

By formula

Sin = √L / 4 and L = 1

Sin = √1 / 4 so value is 1/2

If you want to find the value of Cosec 30 ° is reciprocal of sin° means reciprocal of 1/2 is cosec 30 ° = 2

One more example

### Suppose we get the value of cos 30 °

The formula of **cos° is √R / 4**

Cos 30 ° right = 3 angle 45 °, 60 °, 90 °

Therefore R = 3

Formula is

**Cos = √ R / 4 and R = 3**

Cos30 °. = √3 / √4 means √3 / 2 (sec° reciprocal of cos°)

One more example is

**Tan45 ° is ????**

By formula** tan ° = √L / √R**

Tan45 ° Left Angle is 0 ° and 30 ° and Right Angle is 60 ° and 90 °

L = 2 and R = 2

By formula tan ° = √L / √R

**Tan 45 ° = √2 / √2. = 1**

Value of Cot° is Reciprocal of tan° value

Er. Vijay KumarIt is good solution, nice

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annayya.chandrashekar@gmail.comTrignometry made easy. ….

Rum TanMost of the students always had trouble in calculating the angles. Here they can find their solutions. You have well explained through diagrams which will help students to understand easily. Trigonometry angles are the angles given by the ratios of the trigonometric functions. Trigonometry deals with the study of the relationship between angles and the sides of a triangle. Before discussing the trig angles, students have to look at the definition of angle, and its related terminologies. Trigonometry is an important topic for Class 10, 11 and 12. Hence, it is required for students to learn the concept in a detailed manner to excel in the exam.

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