The height of a cylinder whose radius is 7 cm and the total surface area is 968 sq cm will be_________:

15 cm 17 cm 19 cm 21 cm

15 cm

Total surface area = Curved surface area + Area of 2 circles Total surface area = 2πrh + 2πr2 Total surface area = 2πr (h + r) 968 = 2 x \(\frac{22}{7}\) x 7 (7+h) h = 15 cm