Volume of a Cylinder

A hollow metal cylindrical disc is $3 \mathrm{cm}$ thick and its external diameter is $14 \mathrm{cm}$. If its height is $5 \mathrm{cm}$, find its volume and total surface area. [Use $\mathrm{\pi }=3.14$]

Find the volume and the total surface area of the cylinder. (The dimensions are in $\mathrm{cm}$ ). [Take $\mathrm{\pi }=3.14$]

Find the volume and the total surface area of the cylinder. (The dimensions are in $\mathrm{cm}$ ). [Take $\mathrm{\pi }=3.14$]

A metal cylindrical disc of base radius $4 \mathrm{cm}$ and height $1.5 \mathrm{cm}$ is melted and recast into a cylindrical bar of base radius $2 \mathrm{cm}$. Find the ratio of the total surface area of the disc to that of the bar.