Question

a rectangle of length 22 cm and breadth 7 cm is transformed into a cylinder, the total surface area of the cylinder is

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Answer 1

Answer:

for the rectangle:

lenght, l = 22cm

breadth, b = 7cm

for the cylinder:

circumference = 22cm

2πr = 22

2*(22/7)*r=22

2r/7 = 1

r = 7/2 cm = 3.5cm

height = 7cm

total surface area, TSA

= 2πr(r+h)

= 22(3.5 + 7)             (∵ 2πr = 22cm)

= 22(10.5)

= 231 cm²

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