Question

A cylindrical pillers has a diameter of 56 cm and is of 35 m high there are 16 pillers around the building find the cost of painting the curved surface area of all the pillars at the rate of 5.50 per 1m square ​

Answer 1

Answer:

• Total curved surface area of the pillars = 985.6m²
• Total cost of painting = Rs.5420.8

Explanation:

Given,

A cylindrical pillar with dimensions,

• r(radius) = 56/2 = 28cm. [ Since d = r/2]
• h(height) = 35m

There are 16 such pillars. Find the cost of painting the the curved surface area of all pillars @ 5.50/m²

Conversion of the dimensions in same units.

• Radius = 28cm

= 28 ÷ 100 [Since 1m = 100]

= 0.28m

Curved surface area of the pillar is given by,

→ 2πrh

Where,

• Taking ‘π’ as 22/7

→ 2*(22/7)*(0.28)*(35)

→ 61.6m²

∴ Curved surface area of 16 such pillars :+

→ 61.6*16

→ 985.6m²

Henceforth, Cost of painting is given by,

→ 985.6 × rate of painting

→ 985.6 × 5.50

→ Rs.5420.8

__________________________

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Answer 2

QUESTION :-

• A cylindrical pillers has a diameter of 56 cm and is of 35 m high there are 16 pillers around the building find the cost of painting the curved surface area of all the pillars at the rate of 5.50 per 1m square

GIVEN :-

• A cylindrical pillers has a diameter of 56 cm and is of 35 m high there are 16 pillers around the building

TO FIND :-

• find the cost of painting the curved surface area of all the pillars at the rate of 5.50 per 1m square = ?

SOLUTION :-

radius = diameter/2 = 56/2 = 28 cm = 28/100 m

= 0.28 m

height of cylindrical pillar = 35 m

curved surface area of cylindrical pillar = 2πh

= 2 × 22/7 × 0.28 × 35

= 61.6 m²

Curved surface area of 16 pillars

= 16 × 61.6

= 985.6 m²

Cost of painting 1 m² = Rs 5.50

Cost of painting 985.6 m²

=985.6 × 5.50

= Rs 5420.8

Required answer is Rs 5420.8