Question

There are 900 creatures in a zoo as per list given below:

Beast animals	Other land animals	Birds	Water animals	Reptiles
150	400	175	125	50

Represent the above data by a pie chart.

Answer 1

$$\begin{gathered} \mathrm{Total}\mathrm{number}\mathrm{of}\mathrm{creatures}=900 \\ \mathrm{Central}\mathrm{angle}\mathrm{of}\mathrm{each}\mathrm{component}=\left(\frac{\mathrm{number}\mathrm{of}\mathrm{creatures}\mathrm{in}\mathrm{each}\mathrm{type}}{\mathrm{total}\mathrm{number}\mathrm{of}\mathrm{creatures}}\times 360\right)° \\ \mathbf{Calculation}\mathbf{}\mathbf{of}\mathbf{}\mathbf{central}\mathbf{}\mathbf{angles} \end{gathered}$$

Creatures	Number of creatures	Central angle
Beast animals	150	$60°$
Other land animals	400	$160°$
Birds	175	$70°$
Water animals	125	$50°$
Reptiles	50	$20°$

$$\begin{gathered} \mathbf{Construction}\mathbf{}\mathbf{of}\mathbf{}\mathbf{pie}\mathbf{}\mathbf{chart} \\ \mathrm{Steps}\mathrm{of}\mathrm{construction}: \\ 1.\mathrm{Draw}\mathrm{a}\mathrm{circle}\mathrm{of}\mathrm{any}\mathrm{convenient}\mathrm{radius}. \\ 2.\mathrm{Draw}\mathrm{a}\mathrm{horizontal}\mathrm{radius}\mathrm{of}\mathrm{this}\mathrm{circle}. \\ 3.\mathrm{Draw}\mathrm{sectors}\mathrm{whose}\mathrm{central}\mathrm{angles}\mathrm{are}60°,160°,70°,50°\mathrm{and}20°. \\ 4.\mathrm{Shade}\mathrm{the}\mathrm{sectors}\mathrm{so}\mathrm{obtained}\mathrm{differently}\mathrm{and}\mathrm{label}\mathrm{each}\mathrm{one}\mathrm{of}\mathrm{them}. \\ \mathrm{Thus},\mathrm{we}\mathrm{obtain}\mathrm{the}\mathrm{required}\mathrm{pie}\mathrm{chart}\mathrm{as}\mathrm{shown}\mathrm{in}\mathrm{the}\mathrm{figure}\mathrm{below}. \end{gathered}$$