 Hello and welcome to the session. My name is Mansi and I'm going to help you with the following question. The question says ABC is a triangle in which altitudes B, E and C, F to sides AC and AB are equal. C figure 7.32. Show that first triangle A, B, E is congruent to triangle AC, F and second AB is equal to AC, that is ABC is an isosceles triangle. Let us start with the solution to this question. The first thing we have to prove is triangle A, B, E is congruent to triangle AC, F. So let us consider the triangles A, B, E and triangle AC, F. That is this triangle and this triangle. The first thing that we notice here that angle A is common in both the triangles. So first we can say that angle A is equal to angle A because this is the common angle. Second thing we can say here angle B, E, A is equal to angle C, F, A. That means this angle is equal to this angle because C, F and B, E are the perpendicular. They are each 90 degree equal to C, F, that is given. congruent parts of congruent triangles. Therefore, we have proved the second part also. I hope you understood the question and enjoyed the session. Have a good day.