| Brand | Number of laptops |
| Acer | 60 |
| Dell | 40 |
| Compaq | 20 |
What is the angle of sector representing the number of Dell laptops sold?
A) \[\angle POR\]
B) \[\angle ROV\]
C) \[\angle QOT\]
D) \[\angle POU\]
Correct Answer: B
Solution :
The semicircular region is divided into 6 equal parts (sectors). Therefore, each sector has a central angle of \[{{30}^{o}}\]. Angle of sector representing Dell laptops sold \[=\frac{40}{120}\times {{360}^{o}}={{120}^{o}}=4\times {{30}^{o}}\] In the pie chart \[\angle ROV=4\times {{30}^{o}}\] So, \[\angle ROV\]gives the angle of the sector representing the number of Dell laptops sold.
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