hope you all are safe , this is question from grade 9 maths NCERT the diameter of a roller is 84cm and its length is 120cm.it takes 500 revolutions to move once over to a level a playground .find the area of playground in metre square.. thank you
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Answer:
area of roller
=2πrh
(r=diameter/2= r=42)
=2×22/7×42×120
=31680cm²
area of playground=500×31680
=15840000cm²
in m²
=1584m²
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