Let r and h be the original radius and height of the cylinder, respectively Therefore, initial curved surface area of the cylinder, C = 2πrh New height of the cylinder = 2h Therefore, new curved surface area of the cylinder, C′=2πr×2h=2×2πrh=2× Initial curved surface area of the cylinder. Hence, statement 1 is correct. Let r be the original radius of the hemisphere. Therefore, initial total surface area of the hemisphere,C=3πr2 New radius of the hemisphere = 2r Therefore, new total surface area ofthe hemisphere C′=3π(2r)2=4×3πr2=4× Initial total surface area of the hemisphere Hence, statement 2 is correct.