A circle is circumscribed about a triangle. If one of the angles of the triangle is 120°, and the radius of the circumscribed circle is r, what is the length of the side opposite the 120° angle?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. r.
Length of the side opposite the 120° angle = 2r × sin120°
= 2r × √3/2
= r√3