The height of a solid cylinder is 8 cm and its base radius is 6 cm, a cone of equal height and the radius is extracted from the cylinder, then find the total surface area of the remaining solid.

Original cylinder: r = 6 cm, h = 8 cm. After removing cone with same dimensions, the remaining solid has: exposed top ring (outer circle minus cone base) = π(6² - 6²) = 0, curved surface of remaining cylinder portion = 2π(6)(8) = 96π, and base of cylinder = π(6²) = 36π. Also includes inner curved surface (cone lateral area removed) = π(6)(√(6² + 8²)) = 60π. Total = 96π + 36π + 60π = 192π sq.cm. Note: the cone removal creates a cylindrical cavity with curved surface.