Draw a pie-diagram of the areas of continents of the world given in the following table:
Question:

Draw a pie-diagram of the areas of continents of the world given in the following table:

ContinentsAsiaU.S.S.RAfricaEuropeNoth AmericaSouth AmericaAustralia
Area
(in million sq. km)
26.920.530.34.924.317.98.5

Solution:

We know:

Central angle of a component $=\left(\right.$ component value $/$ sum of component values $\left.\times 360^{\circ}\right)$

Here, total area in million sq km = 133.3

Thus, the central angle for each component can be calculated as follows:
 

ContinentArea (in million sq. km)Sector angle
Asia26.926.9/133.3 ×× 360 = 72.6
U.S.S.R20.520.5/133.3 ×× 360 = 55.4
Africa30.330.3/133.3 ×× 360 = 81.8
Europe4.94.9/133.3 ×× 360 = 13.2
North America24.324.3/133.3 ×× 360 = 65.6
South America17.917.9/133.3 ×× 360 = 48.3
Australia8.58.5/133.3 ×× 360 = 23

Now, the pie chat representing the given data can be constructed by following the steps below:

Step 1 : Draw circle of an appropriate radius.

Step 2 : Draw a vertical radius of the circle drawn in step 1.

Step 3 : Choose the largest central angle. Here the largest central angle is 81.8o. Draw a sector with the central angle 81.8o in such a way that one of its radii coincides with the radius drawn in step 2 and another radius is in its counter clockwise direction.

Step 4 : Construct other sectors representing other items in the clockwise sense in descending order of magnitudes of their central angles.

Step 5 : Shade the sectors with different colours and label them, as shown as in figure below.​​

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