Question

Find the cost of painting the curved surface of ten cylindrical containers of radius 20 cm and height 50 cm at ₹125 per sq.m​

Answer 1

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CSA of a cylinder = 2πrh

CSA of 10 cylinders= 10×2πrh

                                =20πrh

r=20cm=0.2m

h=50cm=0.5m

CSA=$20\times\frac{22}{7}\times0.2\times0.5$

      =6.28m²(Approx.)

1m²=₹125

6.28m²= 125×6.28

        $\huge\boxed{\blue{₹785}}$

Answer 2

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CSA of a cylinder = 2πrh

CSA of 10 cylinders= 10×2πrh

=20πrh

r=20cm=0.2m

h=50cm=0.5m

$\sf CSA=20\times\frac{22}{7}\times0.2\times0.5$

=6.28m²(Approx.)

1m²=₹125

6.28m²= 125×6.28

$\boxed{ \huge\sf \bold{₹785}}$