5.Find the height of the cylinder whose volume is 1.54 $$m^3\$$ and diameter of the base is 140 cm?
Given, V = 1.54 $$m^3$$, d = 140 cm = 1.40 m[∵1m=100cm]
We have,Volume of the cylinder = $$\pi r^2h$$
$$\Rightarrow 1.54=\frac{22}7\times{1.4}2\times\frac{1.4}2\times h\quad$$[(∵$$r=\frac{d}2=\frac{1.4}2$$]
$$\Rightarrow h=\frac{1.5\times2\times2\times7}{1.4\times22\times1.4}=1m$$