Divide an 8-decimeter-long cylindrical steel into two sections, and increase the surface area by 25.12 square decimeters. Calculate the volume of the original steel?

Divide an 8-decimeter-long cylindrical steel into two sections, and increase the surface area by 25.12 square decimeters. Calculate the volume of the original steel?

25.12 △ 2 = 12.56 (cm2) ← floor area
12.56 × 8 = 100.48 (cm3) ← volume