 Hello and welcome to this session. Let us understand the following question today. Take the correct answer and justify. In triangle ABC, AB is equal to 6 to 3 cm, AC is equal to 12 cm and BC is equal to 6 cm. The angle B is A 120 degree, B 60 degree, C 90 degree, D 45 degree. Now before writing solution, let us look at the figure. Here we have triangle ABC where AB is equal to 6 to 3 cm, BC is equal to 6 cm and AC is equal to 12 cm. Now let us write the solution. In triangle ABC, larger side is AC which is equal to 12 cm. So we have AB square plus BC square is equal to AC square. That is 6 to 3 the whole square plus 6 square is equal to 12 square. That is 108 plus 36 is equal to 144. Here we can see 144 is equal to 144 thus triangle ABC is a right angle triangle right angle at B because of converse of Pythagoras theorem which states that in a triangle if square of one side is equal to the sum of the squares of the other two sides then the angle opposite the first side is a right angle therefore angle B is equal to 90 degree. This is our required answer hence the correct option is C which is the required answer. I hope you understood the question. Bye and have a nice day.