Maths by Mr. M. P. Keshari
Example 2. The adjoining pie-chart represents the marks obtained by a student in an examination in english, hindi, science, social science and Mathematics. If the total marks obtained by the students were 720, find his percentage marks and marks in each subject.
Solution:- To solve this problem, we shall use table:
| Subject | Sector Angle | Percentage | Marks |
| English | 550 | 55 X 100/360 = 15.3 | 55 X 720/360 = 110 |
| Hindi | 700 | 70 X 100/360 = 19.4 | 70 X 720/360 = 140 |
| Science | 800 | 80 X 100/360 = 22.2 | 80 X 720/360 = 160 |
| Social science | 650 | 65 X 100/360 = 18.1 | 65 X 720/360 = 130 |
| Mathematics | 900 | 90 X 100/360 = 25 | 90X720/360=180 |
| Total | 3600 | 100 | 720 |
| Subjects | Maths (Part-1) by Mr. M. P. Keshari |
| Chapter 9 | Circle |
| Chapter 10 | Tangents to a circle |
| Chapter 11 | Geometrical Construction |
| Chapter 12 | Troigonometry |
| Chapter 13 | Height and Distance |
| Chapter 14 | Mensuration |
| Chapter 15 | Statistics |
| Chapter 16 | Probability |
| Chapter 17 | Co-ordinate Geometry |