Question

the radius of right circular cylinder is 7 cm and its height is 20 cm find its curved surface area and total surface area​

Answer 1

Step-by-step explanation:

radius = 7 cm

height = 20 cm

C.S.A. of cylinder = 2πrh

                             = 2 x 22/7 x 7 x 20

                             seven gets cancelled,

                             = 2 x 22 x 20

                            = 880 cm²

T.S.A. of cylinder = 2πr(r+h)

                            = 2 x 22/7 x 7(7+20)

                            seven gets cancelled

                            = 2 x 22 x 27

                            = 44 x 27 = 1,188 cm²

Answer 2

Step-by-step explanation:

CSA= 2 × 22/7 × r × h

CSA = 2 × 22/7 × 7 × 20

CSA = 44 × 20

CSA = 880 cm

CSA OF CYLINDER IS 880cm.

TSA = 2 ×22/7 × 7 × 27

TSA = 44 × 27

TSA = 1188 cm

TSA OF CYLINDER IS 1188cm

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