please buddy solve the problem iska answer aaya hai rupee 4620
Answers
Cost of painting of all pillars except 15 cm is ₹349.5
Step-by-step explanation:
GIVEN
Pillars = 14
Diameter = 1 meter
Radius = Diameter / 2 = 1 / 2 = 0.5 meter
Height = 4.5m
Cost of painting of per m² = ₹25
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TO FIND
Cost of painting of all pillars except 15 cm
___________________________
FORMULAS OF CYLINDER
Curved Surface Area of Cylinder = 2πrh
Total Surface Area of Cylinder = 2πr² + 2πrh
Volume of Cylinder = πr² × h
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We know that,
Curved Surface Area of Cylinder = 2πrh
Curved Surface Area of Cylinder = 2 × 3.14 × 0.5 × 4.5
Curved Surface Area of Cylinder = 6.28 × 0.5× 4.5
Curved Surface Area of Cylinder = 3.14 × 4.5
Curved Surface Area of Cylinder = 14.13
Curved Surface Area of Cylinder = 14.13 m²
___________________________
We know that,
Cost of painting of per m² = ₹25
Paint of Curved Surface Area of all pillars except 15 cm
100 cm = 1 m
15 cm = 0.15 m
= 14.13 - 0.15
= 13.98
= 13.98 m²
___________________________
We have to find the cost of painting of 13.98 m²
We know that,
Cost of painting of per m² = ₹25
Therefore,
13.98 × 25
= 349.5