0 votes
in Trigonometry by (53.5k points)

In a triangle ABC, ∠C = 120°. If h is the harmonic mean of the lengths of the sides BC and CA, then the length of the bisector of ∠BCA is

(A)  h

(B)  h/2

(C)  h/√2

(D)  √3/2 h

1 Answer

+1 vote
by (53.8k points)
selected by
Best answer

Correct option (B)  h/2

Area of  ΔACB = 1/2ab sin 120° = √3/4 ab  ..(1)


Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.