Triangle ABC.jpg

 

In Δ ABC, right angled at B. AB = 12 cm, BC = 5cm.

Find sin A, cos A, tan A, cosec A, sec A, cot A

 

First we draw the triangle

 

Step 1 : Finding sides of triangle

In right triangle ABC,

Using Pythagoras theorem

(Hypotenuse) 2  = (Height) 2  + (Base) 2

AC 2   = AB 2  + BC 2

AC 2  = 122 + 52

AC 2  = 144 + 25

AC 2   = 169

AC = √169

AC = √(13 ×13) =√(13 2 ) = 13

 

Hence AC = 13 cm

So, our triangle becomes

 

 

Step 2 : Finding sin A , cos A, tan A

Finding sin, cos, tan when sides of a triangle are given - Part 2

 

Now, let us find cosec, cot and tan

Finding sin, cos, tan when sides of a triangle are given - Part 3

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.