An open tank in the shape of a cylinder has a radius of 6 cm and a height of 20 cm as shown in the figure below. Calculate surface area of the tank.Use π=22/7

                                                                    

A: 754.29 cm²

B: 867.43 cm²

C: 113.14 cm²

D: 805.41 cm²

Correct Answer : B

An open tank has one circular surface closed and one open

Therefore,

Surface area of the cylinder=area of one circles+Area of curved surface

Surface area of the cylinder=(πr²)+πdh

=22/7×6²+22/7×12×20

=113.14+754.29

=867.43 cm²

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