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
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Radius of the roller (r)=
2
84
cm=42cm
length of the roller (h)=120cm
∴ Area of the playground levelled in taking 1 complete revolution 2πrh
=2×227×42×120=31680cm
2
∴ Area of the playground
=31680×500=15840000cm
2
100×100
15840000
m
2
=1584m
2
amswered by mee
......
Answered by
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Answer:
- ⇢height(H)=120cm
- \sf\dashrightarrow \blue{diameter of roller= 84cm}⇢diameterofroller=84cm
- \sf\therefore \blue{radius= \dfrac{diameter}{2}}∴radius=
- 2
- diameter
- \sf\dashrightarrow \blue{ \dfrac{84}{2}}⇢
- 2
- 84
- \sf\dashrightarrow \blue{\cancel \dfrac{84}{2}}⇢
- 2
- 84
\sf\dashrightarrow \blue{radius= 42cm}⇢radius=42cm
Explanation:
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