The angle of each sector will depend on the ratio between the number of students each item and total expenditure (%).
Angle of sector = \(\frac {Value\,of\,the\,item}{Sum\,of\,the\,value\,of\,all\,items}\) x 360°
Steps of construction:
1. Draw a circle with any convenient radius and mark it’s centre as ‘O’.
2. Mark a point A, somewhere on the circumference and join OA.
3. Construct ∠AOB = 108° to represent angle of the sector of Cement.
4. Construct ∠BOC = 36° to represent angle of the sector of Steel.
5. Construct ∠COD = 36° to represent angle of the sector of Bricks.
6. Construct ∠DOE = 54° to represent angle of the sector of Timber.
7 Construct ∠EOF = 72° to represent angle of the sector of Labour.
8. Now ∠FOA = 54° to represent angle of the sector of Miscellaneous.
