Draw a pie-diagram of the areas of continents of the world given in the following table:
|Continents||Asia||U.S.S.R||Africa||Europe||Noth America||South America||Australia|
(in million sq. km)
Central angle of a component = (component value/sum of component values x 360)
Here, total area in million sq km = 133.3
Thus, the central angle for each component can be calculated as follows:
|Continent||Area (in million sq. km)||Sector angle|
|Asia||26.9||26.9/133.3 x 360 = 72.6|
|U.S.S.R||20.5||20.5/133.3 x 360 = 55.4|
|Africa||30.3||30.3/133.3 x 360 = 81.8|
|Europe||4.9||4.9/133.3 x 360 = 13.2|
|North America||24.3||24.3/133.3 x 360 = 65.6|
|South America||17.9||17.9/133.3 x 360 = 48.3|
|Australia||8.5||8.5/133.3 x 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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- Circle Graph Or Pie Chart - Drawing Pie Charts