A traffic police chowki is made with cylinder pillar of height 7 metres and radius 3.5 metres mounted on a cylinder base of a diameter 14 metres and height 1 metre a conical top of diameter 14 cm is kept on the top of the cylinder pillar if the height of the the police chowka is 15 metres then find the cost of painting @ rupees 15 per metre
CAN ANYONE SOLVE THIS ?
Answers
Step-by-step explanation:
Given : Radius of cylindrical pillar = r = 50 cm = 0.5 m
Height of cylindrical pillar = h = 3.5 m
Number of cylindrical pillars = 12
Cost of painting per square metre = Rs 20
To find : The cost of painting the lateral surface of the pillars
Formula : CSA of cylinder = 2πrh
Solution : The lateral surface of a cylinder is the curved surface of the cylinder.
Area to be painted for one pillar = CSA of cylinder = 2πrh
= 2 ×
× 0.5 × 3.5
= 11 m2
Total area to be painted for 12 cylinders = 11 × 12 = 132 m2
Total cost of painting = Area to be painted × cost of painting per square meter
= 132 × 20 = Rs 2640
∴ The cost of painting 12 cylindrical pillars is Rs 2640.
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Answer:
22/7 (2*3.5*7+2*7+7*7)
22/7 (7*7+14+49)
22/7 (49+14+49)
22/7 (112)
22*16
352
therefore 1m is 15
and 352 ?
352*15
5280
answer 5280