Question

12. The total surface area of a right circular cylinder whose height is 15 cm and the radius of the base is 7 cm, is​

Answer 1

Answer:

total surface area  = 814 cm²

Step-by-step explanation:

given

height is  H =  15 cm

radius of the base is R = 7 cm

now

perimeter of base = 2πR

= 2×π×7 = 2(22/7) 7

= 44 cm

now curved surface area of cylinder = perimeter of base × height of cylinder

curved surface area of cylinder = 44×15 = 660 cm²

now

circular surface area = πR² = (22/7)7² = 154 cm²

so

total surface area of cylinder = curved surface area + 2 × circular surface area

total surface area = 660 cm² + 154 cm²

total surface area  = 814 cm²