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Question
The following diagram represents expenditure on different items in constructing a building.
If the total construction cost of a building is Rs.540000, answer the following questions :
Find the central angle for labour expenditure.
Solution
Total cost = Rs.540000
Let the measure of central angle of labour be θ.
∴ θ + 90° + 45° + 75° + 50° = 360° .....[∵ The measures of a circle is 360°]
∴ θ + 260° = 360°
∴ θ = 360° - 260°
∴ θ = 100°
The cental angle for labour expenditure is 100°.
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