Question

how to find area if inner radius is 45 and outer radius 52 of a cirlcle​

Answer 1

Answer:

Step-by-step explanation:

area of smaller circle= π$r^{2}$

                                  =π × 45 ×45

                                  =2025π

area of bigger circle= π$R^{2}$

                                 = π × 52 × 52

                                 =2704π

area to be calculated = area of bigger circle - area of smaller circle

= (2704-2025)π

=(679)π