Question

Find the cost of laminating decolam to a circular table of radius 1.4 m if the rate of decolam is rupees 50 per square metre

Answer 1

`\bf \textit{area of a circle}\\\\ A=\pi r^2\quad \begin{cases} r=radius\\ -----\\ r=1.4 \end{cases}\implies A=\pi 1.4^2\implies A=\stackrel{m^2}{1.96\pi} \\\\\\ \textit{now, decolam is }\stackrel{rupees}{50}~per~m^2\implies \stackrel{\textit{total cost}}{50\cdot 1.96\pi }`