Area of six slanted triangular sides of the pyramid, each with a base of 10cm and apothem of 13cm, is 6*(1/2)*10*13 = 390cm2
Area of base is that of six equilateral triangles each of side 10cm, so area = 6*25*√3cm2 = 150√3cm2
So total area = 390+150√3 cm2
.
+111 
