Grade 12Algebra
In a triangle ABC and R is the radius of the circle into which the triangle is inscribed(in other words it is the circum radius of the triangle)
then prove it is an equilateral triangle
1 Answer
SAGAR SINGH - IIT DELHI
Approved Tutor Answer15 Years agoDear 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 
.
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