1, because the triangle CAB is right-angled, the angle CAB=90 degrees, the square of AB+the square of AC = the square of BC, that is, the sum of the squares of BC=6 +8 has roots, and BC= 10, because the triangle ABC = 1/2 * AB * AC = 65438.

2.△ABE= 1/2*AD*BE, because AE is the midline, BE=EC=5. S△ABE= 1/2*4.8*5= 12。