Question

a cylindrical pillar is 50cm in diameter and 3.5 cm in height . the cost of painting its curved surface area at the rate of Rs. 12.50 per sq meter is ​

Answer 1

Given

• Diameter of cylinder=50cm
• Height of cylinder = 3.5cm
• Cost of painting = Rs.12.50per m²

To Find

• Curved surface area
• Cost of painting cylinder pillar

Solution

Height of cylinder = 3.5cm

Diameter of cylinder=50cm

Radius of cylinder = Diameter/2 = 50/2=25cm

We know that

$\sf{Curved \: surface \: area \: of \: cylinder(C.S.A \: of \: cylinder )= 2\pi r h }$

$\sf{C.S.A of cylinder = 2 \times \dfrac{22}{7} \times 25 \times 3.5 }$

$\sf{C.S.A of cylinder =44 \times 25 \times 0 .5 }$

$\sf{C.S.A of cylinder =44 \times 12 .5 }$

$\sf{C.S.A of cylinder =550 {cm}^{2} }$

Now,

The cost of painting 1m² is given as Rs.12.50

• Therefore, the cost of painting 550cm² will be equal to = 12.50 × 550 = Rs.6875

Answer 2

Answer:

☆ See the attachment photo.

☆ Two types solutions are there which one you want your choice.

=> Rs 68.75.

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