What will be the height of a cylinder whose radius is 7 cm and the total surface area is 968 sq cm ?

15 cm 17 cm 21 cm 25 cm

15 cm

Total surface area = 2πr (h + r) 968 = 2 x\(\frac{ 22}{7 }\) x 7 (7+h) 968 = 44(7+h) 968 = 308 + 44h 44h = 660 h = \(\frac{660 }{44 }\) h =15 cm