Question

Sectors of two concentric circle of radio 12cm and 9cm ate given if amgle aob=80 degree find the area of shaded region

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

Given Sectors of two concentric circle of radii 12 cm and 9 cm ate given if angle aob = 80 degree find the area of shaded region

• Now area ADOB = area of sector AOB – area of sector ODE
•                        We have area of sector = θ/360 x π r^2
•                            = 80 / 360 x 22/7 x 12 x 12 – 80 / 360 x 22/7 x 9 x 9
•                            = 704 / 7 – 396 / 7
•                            = 704 – 396 / 7
•                             = 308 / 7 sq cm
• Area of circular ring = π (R^2 – r^2)
•                                  = 22/7 (12^2 – 9^2)
•                                  = 22/7 (144 – 81)
•                                  = 63 x 22 / 7
•                                  = 198 sq cm
• Therefore Area of shaded region = 198 – 308 / 7
•                                    = 1386 – 308 / 7
•                                     = 1078 / 7
•                                     = 154 sq cm

Reference link will be

https://brainly.in/question/2698278

https://brainly.in/question/8020674