**CBSE NCERT Solutions Chapter 6 Triangles Exercise 6.5 Question 17**

**17.** Tick the correct answer and justify: In , AB = , AC = 12 cm and BC = 6 cm. The angle B is:

**(A) 120 (B) 60 (C) 90 (D) 45**

**Solution:**

Therefore,

Therefore, **by Converse of Pythagoras Theorem**, is right angled at B.

** {In a triangle, if square of one side is equal to sum of squares of other two sides then the triangle is right angled.**

Therefore, answer is **(C)**