# If A, B and C are the angles of a ABC, prove that

Since A, B and C are the angles of a triangle, therefore sum of the angles equals 180°.

A + B + C = 180° C + A = 180° - B

Now, consider L.H.S. =

=

=

= cot = R.H.S.

Hence, proved.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
T- Ratios of Specified Angles58 mins
Quiz | Task on Trigonometric Ratios46 mins
Testing the T- Ratios of Specified Angles57 mins
Quiz on Trigonometric Ratios31 mins
Trigonometric Identities33 mins
Champ Quiz | Trigonometric Identities33 mins
NCERT | Trigonometric Identities52 mins
Trick to learn all Trigonometric Formulae28 mins
Nature of Roots of Quadratic EquationsFREE Class
Quiz on Number of Solutions of an Equation24 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses