D is a point in the triangle ABC. Try to compare the size of AB + AC and BD + CD, and explain the reason

D is a point in the triangle ABC. Try to compare the size of AB + AC and BD + CD, and explain the reason

The answer is ab + AC > BD + CD, because D is a point in the triangle, the area of the triangle is s (ABC) > s (ABD), and the bottom edge is the same edge BC