Question

Find the area of the shaded part if the inner radius is 3.5cm and outer radius is 7cm​

Answer 1

Answer:

Given that, three circles are in such a way that each of them touches the other two. Now, we join centre of all three circles to each other by a line segment. Since, radius of each circle is 3.5 cm. So; AB = 2 x Radius of circle = 2 x 3.5 = 7 cm. ⇒ AC = BC = AB = 7cm which shows that, ΔABC is an equilateral triangle with side 7 cm. We know that, each angle between two adjacent sides of an equilateral triangle is 60° ∴ Area of sector with angle ∠A = 60°. Read more on Sarthaks.com - https://www.sarthaks.com/124295/three-circles-each-radius-drawm-them-touches-other-find-area-enclosed-between-these-circles