In a triangle ABC and R is the radius of the circle into which thetriangle is inscribed(in other words it is the circum radius of thetriangle)then prove it is an equilateral triangle

Dear ankit,

we know that . Multiply out the left side to get . Thus the equation becomes , which you can write as . That obviously only holds if .

We are all IITians and here to help you in your IIT JEE preparation.

All the best.

 If you like this answer please approve it....

win exciting gifts by answering the questions on Discussion Forum

Approved