the diameter of a 120 cm long roller is 84 cm It takes 1000 complete r

1.	the diameter of a 120 cm long roller is 84 cm It takes 1000 complete revolutions in moving once over to level a playground what is the area of the playground
Answer» here you can radius = 84/ 2 cm = 42 cm & roller=120 or, area of the roller = 2πrh = 2 × 22/ 7 × 42 × 120 cm2 = 44 × 720 cm2= 31680 cm2 ∴ area covered by the roller in 1 REVOLUTION = 31680 cm2 ∴ area covered by the roller in 500 REVOLUTIONS = 31680 × 500 cm2 = 15840000 cm therefore area = 15840000/ 100× 100 m2 = 1584 m2 Ans.

the diameter of a 120 cm long roller is 84 cm It takes 1000 complete revolutions in moving once over to level a playground what is the area of the playground

Answer»

here you can radius = 84/ 2 cm = 42 cm & roller=120 or, area of the roller = 2πrh

= 2 × 22/ 7 × 42 × 120 cm2 = 44 × 720 cm2= 31680 cm2

∴ area covered by the roller in 1 REVOLUTION = 31680 cm2

∴ area covered by the roller in 500 REVOLUTIONS = 31680 × 500 cm2 = 15840000 cm

therefore area = 15840000/ 100× 100 m2 = 1584 m2 Ans.