Edexcel A-Level - October 2020 - Advanced Pure Mathematics 1 - Question 11 - Exam Paper Walkthrough

Full walkthrough answer to Question 11 on the Edexcel A-Level Mathematics, Pure Mathematics 1, Paper 1, October 2020.
Circle C1 has equation x^2 + y^2 = 100
Circle C2 has equation (x − 15)^2 + y^2 = 40
The circles meet at points A and B as shown in Figure 3.
(a) Show that angle AOB = 0.635 radians to 3 significant figures, where O is the origin.
The region shown shaded in Figure 3 is bounded by C1 and C2
(b) Find the perimeter of the shaded region, giving your answer to one decimal place.
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