Question

the height of cylinder pillar is 15m. the diameter of its base is 350cm what will be the cost of painting the curved surface of the pillar at Rs 25per m2

Answer 1

Answer:

curved surface area of the pillar

2πrh = 2x22/7x350/200x15m^2

cost of painting the curved surface area

=Rs 25 X 165 = Rs 4125

Answer 2

The cost of painting the curved surface of the pillar at Rs 25 per m² is Rs 4125.

Given: Height of cylinder pillar,h =  15 m

Diameter of its base,d = 350 cm = 350/100 = 3.5 m

Radius of the base of the cylinder pillar ,r = 3.5/2 m = 1.75 m

To find: The cost of painting the curved surface of the pillar at Rs 25 per m².

Formula used:

Curved surface Area of cylinder = 2πrh

Solution:

Step 1: Find Curved surface Area of pillar:

Curved surface Area of cylindrical pillar = $\bf 2 \times \pi \times r \times h$

Curved surface Area of cylindrical pillar = $\bf 2 \times \frac{22}{7} \times 1.75 \times 15$

Curved surface Area of cylindrical pillar = $\bf 2 \times 22 \times 0.25 \times15$

Curved surface Area of cylindrical pillar = 165 m²

Step 2: Find the cost:

Cost of painting 1 m²  curved surface of the pillar = Rs 25

Cost of painting 165 m²  curved surface of the pillar = $\bf \ Rs 25 \times 165$ = Rs 4125

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