 Hello and welcome to the session. In this session we discussed the following question which says in a triangle one angle is equal to the sum of other two angles. What kind of triangle is this? Let's move on to the solution now. Consider this triangle ABC. We are given in the question that one angle is equal to the sum of the other two angles. So let's say that angle A is equal to angle B plus angle C. Let this be equation 1. Now in triangle ABC, sum of the angles that is angle A plus angle B plus angle C is equal to 180 degrees using the angles and property of a triangle. Let this be equation 2. Now next adding angle A to both sides of equation 1. We get angle A plus angle A is equal to angle A plus angle B plus angle C that is 2 times angle A is equal to 180 degrees using equation 2 in which we have angle A plus angle B plus angle C is equal to 180 degrees. So from here we get angle A is equal to 180 degrees by 2. Now 2 90 times is 180 so this is equal to 90 degrees that is we have angle A is equal to 90 degrees. Now that we have got one angle of the triangle ABC as 90 degrees so this means that triangle ABC is the right triangle. So this is our final answer. This completes the session. Hope you have understood the solution of this question.