the diameter of a roller is 42cm and it lenght is 100cm. it takes 750 complete revolution moving once over to level a play ground.find the area of play ground.
only for 13 to 14 girls girls
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Answer:
Area of ground = 400 × CSA of cylindrical roller
= 2 × pi× r×h ×400
= 2×22/7 × 21 × 100 × 400
=5280000 cm^2
=5280000/10000 m^2
= 528 m^2
Cost of levelling 105 m^2 = rs.50
so cost of leveling 1 m^2 = 50/105
So cost of leveling 528 m^2 = 50/105 × 528 = RS.25.14
Step-by-step explanation:
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