Question

Find the cost of polishing a circular table top of radius 2.8 cm , if the rate of polishing is ₹20/m²​

Answer 1

$\huge\underbrace\bold\red{ Answer }$

$Given \: diameter \: of \: table \: \\ (circular) =1.6m$

$radius =0.8m$

$area \: of \: circle \: = πr2 \\ =3.14×0.64=2.0096m2$

$Now \: rate \: of \: polishing \: per \: meter \\ \: square =15Rs$

$Cost \: of \: polishing \: table top \\ = 15×2.0096$

$cost = 30.14m2$

Answer 2

Step-by-step explanation:

$\begin{gathered}Given \: diameter \: of \: table \: \\ (circular) =1.6m\end{gathered} </p><p>Givendiameteroftable</p><p>(circular) =1.6m</p><p> </p><p> </p><p></p><p>radius =0.8mradius =0.8m</p><p></p><p>\begin{gathered}area \: of \: circle \: = πr2 \\ =3.14×0.64=2.0096m2\end{gathered} </p><p>areaofcircle= πr2</p><p>=3.14×0.64=2.0096m2</p><p> </p><p> </p><p></p><p>\begin{gathered}Now \: rate \: of \: polishing \: per \: meter \\ \: square =15Rs\end{gathered} </p><p>Nowrateofpolishingpermeter</p><p>square =15Rs</p><p> </p><p> </p><p></p><p>\begin{gathered}Cost \: of \: polishing \: table top \\ = 15×2.0096\end{gathered} </p><p>Costofpolishingtabletop$

= 15×2.0096

cost = 30.14m2cost= 30.14m2